TSO Products

MTR-18 Precision System Triangle Set

(13 reviews) Write a Review
  • The MTR-18 now comes standard with a Kaizen Foam Systainer insert, which fits perfectly into a T-LOC Systainer or Systainer3 M 112.
  • With UJK Dog Rail Clips (sold separately), the MTR-18 can be connected to your guide rail to act as a super-sized adjustable angle square.
  • Cut large panels at odd angles with the MTR-18.
  • Squaring cabinet casing for assembly or glue-up is easy with the included clamping angles.
  • Use the MTR-18 to square your MFT/3 guide rail to fence - the single most important measurement to make before any cut!
  • Here you can see the Squaring Pins protruding from the face of the MTR-18 and contacting the MFT/3 guide rail.
  • Square your MFT/3 hole pattern to guide rail. This is an important dimension if you're using dogs to align workpieces before cutting.
  • Don't assume you're 20x96mm hole pattern is in perfect alignment with your guide rail.
  • Mark perfect 90s or 45s on your workpiece with the MTR-18.
  • Mark perfect 90s or 45s on your workpiece with the MTR-18.
  • The MTR-18 Set includes our Master Accessory Kit in a custom foam insert. No need to worry about losing the small parts! Systainer sold separate
  • A view of the MTR-18 accessories shown outside a TSO branded Systainer3 M 112 enclosure (sold separately).
  • Here's a close-up view of the MTR-18 accessories inside a TSO branded Systainer3 M 112 enclosure (sold separately).


The World's Most Versatile 18" (457mm) Precision Woodworking Triangle

Unboxing the MTR-18 video.
Watch this video for a complete unboxing of the MTR-18, including the Accessory Kit housed in the Kaizen Foam Systainer insert.

A first-of-its-kind tool, the MTR-18 combines the accuracy of a CNC-machined precision triangle with a range of included accessories enabling countless linear and angle measurement, squaring and clamping/fixturing applications. Designed to take advantage of popular 20mm hole patterned worktops, the MTR-18 can be secured through the worktop with the included DoubleGroove Bench Dogs and M8 SpeedKnobs. Dial in a precise angle with the MTR-18's large protractor scale with parallax-free pointer—and then lock it in place. With a long edge of more than 635mm (25") and body thickness of over 6mm (1/4”), the MTR-18 can even act as a removeable fence for the Festool MFT/3 or any 20x96mm patterned work surface. When used in conjunction with an MFT/3 style 20mm worktop, the MTR-18 sets the standard for accuracy and speed of set-up.

  • Supremely Accurate: Machined on high-precision CNC machining centers and made from dimensionally stable precision aluminum tooling plate guaranteed square to within .001" over its 18" length (as verified using automated CMM).
  • Removable Foot: Enables freestanding use or quick angle measurement off the edge of your table or workpiece. Includes hex driver and stainless socket screws which can be conveniently stowed in tapped holes along the foot when not in use. With foot, the MTR-18 functions like a super-sized speed square to guide any circular saw on the job site.
  • Festool Compatible: Arc slot is 20mm wide, perfectly positioned to align with the holes on your Festool MFT/3 table, and accept included DoubleGroove™ Large Dogs—providing an accurate, repeatable, and adjustable means of rapidly aligning workpieces or ensuring the squareness of your Festool fence, guide rail and grid pattern.
  • Repeatable Accuracy: Cardinal angles of 0, 15, 22.5, 30, and 45 degrees can be quickly set with included indexing pointer and brass locking knob to create regular shaped polygons.
  • Edge Locator Pins: The shorter pair of M6 index pins can be attached to one side of the triangle's face, acting as a foot while leaving the opposite face unobstructed for layout work.
  • Connecting Pins: Accurately square the Festool MFT/3 guide rail to the fence, even when the rail is elevated. Can also be used to connect the triangle to a guide rail using UJK Dog Rail Clips (not included). See image depiction.
  • Dual Dimensioned: Our triangle products are easy to read. Both Imperial or Metric measurement included (one on each side).
  • Clamping Squares: Transform the MTR-18 into a large clamping square. Secure with clamps (not included) to square cabinet case during assembly/glue-up.
  • Made in the USA: The MTR-18 Precision System Triangle Set is manufactured in low volume and stocked in Minnesota.
  • NEW! Custom Systainer Kaizen Foam Insert: Keep all of your MTR-18 accessories in one place with the included custom Kaizen Foam insert, fitting T-LOC and Systainer3 enclosures. Systainer not included, but we do offer our very own Systainer3 M 112 enclosure which will fit this insert.

Now Standard: Master Accessory Kit + Kaizen Foam Systainer Insert

Kaizen Foam Insert with MTR-18 Accessory Kit Included StandardPreviously available as an additional option, the MTR-18 Master Accessory Kit is now included with every MTR-18 triangle set. This comprehensive accessory package includes everything you need to secure the MTR-18 to your perforated worktop, dial in infinite and repeatable angles, and utilize the triangle as a jumbo clamping square. This kit includes a finely machined pointer with parallax-free viewport, a brass locking pin and ergo knob with t-bolt, four DoubleGroove™ Dogs (two DoubleGroove Standard Fit Large Dogs and two DoubleGroove Close Fit Large Dogs), two M8 SpeedKnobs™, two clamping angles, and two Allen drivers. To keep all these accessories together, we also include a custom Kaizen Foam Systainer insert to hold all components, plus a handy stowage tin to include the very small hardware as well.

6 Ways to Use the MTR-18: How many more will you dream up?

Set and cut any angle on any size workpiece!

Setting Any Angle on a Large Workpiece
With a long and extremely accurate edge, the MTR-18 can be used to cut any angle in any size workpiece; the only limitation being your length of guide rail or cutting surface! Here, the MTR-18 is setting the angle and acting as the fence for a large panel before being cut with a track saw.

Attach the MTR-18 to Guide Rail with UJK Dog Rail Clips

Connecting Triangle to Guide Rail—No 20mm Worktop Needed
The MTR-18 can be directly attached to your guide rail by way of UJK Dog Rail Clips. With the included bench dogs projecting beneath the indexing pointer, you can now reference off the front edge of your workpiece to cut at any angle, without requiring an MFT/3 or similar 20mm patterned worktop.

Mark perfect 90 or 45 degree angles on your workpiece

Marking Perfect 90s or 45s with the Removeable Foot or Edge Locator Pins
The MTR-18 excels at standard triangle duty, such as marking perfect angle or perpendicular lines on your workpiece. Use the removeable foot for this task, or attach the included Edge Locator Pins which form a line on the face of the triangle. The longer Edge Locator Pins can also help you align the triangle against curved edges of your workpiece.

Square a cabinet case with the MTR-18 clamping angles

Squaring Cabinet Casing for Assembly or Glue-Up
Install the included clamping angles on the MTR-18 and use two clamps (not included) to square cabinet casings for dry fitting or glue-up.

Square MFT/3 guide rail to fence

Square MFT/3 Guide Rail to Fence
The single most important angle to calibrate in a Festool MFT/3, ensuring the guide rail sits at a perfect 90 degrees to the back fence, takes mere seconds with the MTR-18. And with the included pins, you can even check for squareness while the guide rail is in its elevated position.

Square guide rail to 20mm hole patterned worktop

Squaring Guide Rail to 20mm Hole Pattern
With the included DoubleGroove bench dogs, it's easy to establish squareness between your 20mm worktop and guide rail.

What's Included in the Box

  • Custom Kaizen Foam Systainer Insert for MTR-18 Accessories
  • MTR-18 Precision Triangle Body
  • MTR-18 Removable Foot
  • M6 Short Pins for Edge Indexing (2)
  • M6 Long Pins for Squaring/Connecting (2)
  • Pointer with Parallax-Free Viewport
  • Brass Locking Pin, M6 Ergo Knob & T-Bolt
  • DoubleGroove Large Dogs - Standard Fit (2)
  • DoubleGroove Large Dogs - Close Fit (2)
  • M8 SpeedKnobs (2)
  • Clamping Angles (2)
  • M4 Socket Head Cap Screws (6)
  • M6 Socket Head Cap Screws (6)
  • 3mm Hex Driver
  • 5mm Hex Driver
  • Storage Tin for Above Small Parts
View AllClose

Warranty & Returns

TSO brand products are guaranteed for five years from date of sale against defects in materials or workmanship. Normal wear and tear and accidental damage are not covered. For any product determined to have a defect covered by this warranty, TSO Products will repair or, at its option, replace with current comparable product. Warranty requests require an RMA (return authorization number) prior to any return. Request an RMA number by contacting TSO Customer Service (
View AllClose

13 Reviews

  • 5
    Already Being Used On A Daily Basis

    Posted by Mark Trierweiler on 2nd Apr 2024

    There’s nothing like owning a tool that you have 100 percent confidence in.

  • 5

    Posted by Johntools on 1st Sep 2023

    This is a great tool I am so happy with my purchase

  • 5
    Impressed beyond words

    Posted by MCMattheLake on 8th Feb 2023

    I will be the first to admit that I learned be tools. I like making and building and appreciate those things that allow me do work quicker, more exact or even more elegantly. This triangle is a little bit in each category. After year's of having a flexvolt track saw, I finally ditched it and bought one a new Makita 40v primarily so that I could use the TSO GRS16. I won't get into a long winded debate of festool but I appreciate the festool system view. Similar to festool, the way that TSO products integrate with each other means that they work together. Many years ago I bought the big red triangle. While it is precise and well made the usefulness is diminished when comparing it to the TSO product. The TSO is equally well made, equally precise, but useful in so many facets of work. I probably won’t sell my red triangle, but increased time on the wall in it's custom holder seems to be more likely as I find the TSO tool being used in layout, cut, and build processes. A word about what I received. I know that there is a expectation when one orders premium products, but I must include that my jaw dropped when I opened the package. Having the foam precut for a sustained to contain all the accessories is a really nice touch. I wish they gave a pack out option, but I will never be without systainers. I would say that when you purchase the triangle, it would seem a good idea to have an alternate configuration with a systainer.

  • 5
    MTR-18 Precision System Triangle Set

    Posted by Bruce Campbell on 30th Aug 2022

    Expensive I expect that the quality and accuracy is equal to my other TSO products and therefore the cost will balance out.

  • 5

    Posted by William J on 28th Feb 2022

    Useful in many ways. Precise. In conjunction with my Benchdogs fence I am well equipped!

View AllClose