TSO Products

GRS-16 PE v2 Parallel Edge Guide Rail Square

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  • Achieve perfectly square cuts in record time with the GRS-16 PE v2 Guide Rail Square.
  • The fastest, easiest and most accurate way to square cuts with your FESTOOL, MILWAUKEE, MAKITA or POWERTEC track saw guide rail.
  • The GRS-16 PE is now compatible with Milwaukee's M18 FUEL plunge saw!
  • Once attached, the GRS-16 PE v2 becomes a rigid part of your guide rail.
  • High strength, custom draw latch with dipped coating protects your guide rail.
  • Your guide rail is completely supported by the full-height, precision machined mating edge of the GRS-16 PE v2.
  • Perfectly balanced, the GRS-16 PE v2 is suitable for use off the front or back edge of the workpiece, unsupported.
  • Once clamped, just slide the assembly up to your workpiece and start making square cuts.
  • New in v2: insert square at any point along the rail, avoiding clamps, hose deflectors and other accessories occupying the guide rail's bottom T-slot.
  • Comfort grip makes it comfortable to clamp and unclamp the latch quickly.
  • Clamping slots on both reference edges of the GRS-16 PE accommodate T-track clamps such as Festool's Screw Clamps and Quick Clamps.
  • Use the GRS-16 PE to square off either the front or back of your workpiece.
  • Cut down the bottom of doors with ease using the GRS-16.
  • Use the GRS-16 PE v2 in place of a Guide Rail Adapter with the TSO Parallel Guide System.
  • Compatible with the TSO Parallel Guide System. Shown here with TPG-20 track.
  • Compatible with the TSO Parallel Guide System.
  • Compatible with the TSO Parallel Guide System.
  • Get perfectly parallel, repeatable cuts when you add the TSO Parallel Guide System to your Guide Rail Square.
  • Extend your guide rail square's effective reference edge thickness and length with our optional Angle Accessory.
  • Two guide rail squares fit neatly into a Systainer with our custom foam insert (sold separately).
  • Store and protect your GRS-16 on the go, with our Foam Insert and TSO Systainer3 (sold separately).
Now: $170.96
Was: $189.95


The Original, Patented Dual-Edge Guide Rail Square for Festool®, Milwaukee®, Makita®, Powertec®, WEN® & Triton® Track Saws

GRS-16 PEv2 New Quick Installation Feature

Introducing the newest version of the best-selling guide rail square on the market: the GRS-16 PE v2. Designed to make it much faster to achieve dead square cuts with your track saw, our newest square improves upon the original GRS-16 by adding a second "parallel edge" to permit squaring against the front and back of your workpiece.

What makes the GRS-16 PE v2 the best tool of its kind?

  • NEW! Rapid attachment feature: simply insert the square at any point along the guide rail and clamp it in place—no need to slide it into the guide rail from one of the ends or remove hose deflectors, clamps, or other accessories occupying the guide rail T-slot
  • NEW! Now compatible with Milwaukee M18 FUEL™ 6-½" Plunge Track Saw guide rails.
  • Single-piece design that self-squares to 90° with no adjustments needed (and no points of failure in the future)
  • Lighter than its predecessor despite being CNC machined from 25% thicker aluminum, with improved guide rail support and engagement
  • Draw latch hook now features a resilient coating to grasp your guide rail and protect it from marring
  • Notches in both reference edges accommodate popular clamps like the Festool Screw Clamp (489570), Quick Clamp (FS-HZ 160), and Axminster clamps
  • Threaded M6 accessory mounting holes enable connection to the TSO Parallel Guide System and Angle Accessory
  • Two squares fit in a Systainer—see our Systainer Foam Insert and limited edition TSO Blue Systainer3 M 112
  • New, fully recyclable all-corrugated packaging

See How It Works

Simple, Automatic Accuracy

Before the GRS-16, methods for squaring a track saw relied on the loose-tolerance T-slot found in every guide rail. To overcome this inherent inaccuracy, woodworkers relied on a separate reference square, plus a combination of loose parts like T-bars, hex bolts, and knobs. These shop-made solutions would often quickly fall out of square, requiring constant vigilance and recalibration to maintain accuracy.

The patented GRS-16 PE solves this problem with a simple one-piece design that self-squares as it attaches to the guide rail. Once the powerful draw latch is engaged, the GRS-16 PE becomes a rigid extension of your guide rail, providing two precise 90° reference edges that won’t fall out of square over time. Despite its high clamping strength, a comfort coating on the latch handle makes it easy to generate the leverage necessary to engage, release or reposition the square along your length of track.

Made in the USA with a Five-Year Warranty

The GRS-16 PE is precision CNC machined from a single piece of 5/8" (15 mm) thick 6061-T6 aluminum and anodized for a non-marring, durable finish. The GRS-16 PE is made in Minneapolis, United States, and comes with a five-year warranty.

GRS-16 or GRS-16 PE?

If you need the ability to reference off the front and back edge of your workpiece, select the GRS-16 PE. If you want the absolute smallest and lightest form factor and anticipate using the square for conventional cuts referencing the front edge of your workpiece, choose the GRS-16.

Connect your GRS-16 PE to the TSO Parallel Guide System

A System Approach

The GRS-16 PE is much more than a guide rail square; it's the foundation of a broader system of TSO Products designed for interoperability. In fact, the GRS-16 PE can be connected to the TSO Parallel Guide System via its accessory mounting holes. Once connected, you can repeatedly square and parallel rip multiple workpieces.

Festool MFT/3 Compatibility

Did you know the GRS-16 PE can be connected directly to your MFT/3 guide rail hinge bracket? The time-consuming re-squaring process of the MFT guide rail is now a thing of the past. Rail squareness is now assured, unaffected by varying material thickness and rail height adjustment. The inspiration for this improvement came from customer Simon H., a Festool MFT/3 user in the UK. We listened and took action. Thank you, Simon!

We engineered this feature to keep the kerf line in exactly the same location as your standard MFT/3. You can quickly change back to the original MFT/3 arrangement any time.

GRS-16 PE connects perfect square to MFT/3

It does not get any more accurate than this!

Technical Details

  • Dimensions: 15.2 x 6.0 x 1.4 inches (386 x 152 x 36 mm) - click here for dimension drawing
  • Weight: 1.9 lbs (862 g)
  • Material: 6061-T6 aluminum, anodized, 5/8 in (15 mm) thick
  • Compatible Guide Rails: Fits Festool, Milwaukee, Makita, Powertec and Triton. Not compatible with Festool HK 55 Carpentry Saws including the FSK 250, FSK 420 and FSK 670. Not compatible with Bosch, DeWalt, or Kreg tracks. For DeWalt compatibility, see separate GRS-16 PE D model. For Kreg compatibility, see separate GRS-16 PE K model.
  • Clamping Mechanism: Over center draw latch (304 stainless steel) with compensating spring; secured with M4x0.7-10 stainless steel socket head screws
  • Accessory Mounting Holes: Tapped for M6 threads for compatibility with TSO Parallel Guide System and Angle Accessory


Quick video walkthrough of the original GRS-16 PE.

Special thanks to Eric at The Poplar Shop for his unexpected video review of the original GRS-16!

Guide Rail Square Comparison Table

Guide Rail Square
Guide Rail Square
  GRS-16 GRS-16 PE
Best for… Squaring your guide rail by referencing off the front edge of your workpiece Squaring your guide rail by referencing off either the front or back edge of your workpiece
Price $179.95 $189.95
Optional Add-ons TSO Parallel Guide System
TSO Limited Edition Systainer³ M 112
FoamPack Storage Insert for T-LOC Systainer & Systainer³ M 112
Angle Accessory
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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 (
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245 Reviews

  • 5
    Great Product

    Posted by Ernest Swofford on 7th May 2024

    This is a great product. It does exactly what it is advertised to do. Awesome quality very well made as is all of TSO products.

  • 4
    Tso guide rail square

    Posted by Michael Smith on 4th May 2024

    Price point too high

  • 5

    Posted by Robert Richardson on 2nd May 2024

    Very handy. My miter saw has a 10" capacity. A project required squaring up some 12" boards 8' long. I was thinking of a new slider but my track saw and new edge guide worked so well that a new saw is on the back burner.

  • 5
    Guide Rail Square - Milwaukee

    Posted by Frank T on 30th Apr 2024

    I bought the new version of the GRS-16 for the Milwaukee track. First off, right out of the box you can just tell this is a nice piece of equipment. I had high expectations, and it fully delivered. I used it on a couple simple tasks, and this made them even easier to get a nice square cut. This is my first TSO product, and it will not be my last.

  • 5
    High quality

    Posted by Jeffrey Whittaker on 16th Apr 2024

    I bought the GRS -PE V2 version because it works for Milwaukee and festool, Very impressed with the workmanship and quality of this product

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