GRS-16 PE: Parallel Edge Guide Rail Square
Patented precision guide rail square for FESTOOL®, MAKITA® & TRITON® track saw guide rails
Introducing the newest version of the best-selling guide rail square on the market: the GRS-16 PE. Like its sibling GRS-16, the GRS-16 PE is designed to make it much faster to achieve dead square cuts with your FESTOOL, MAKITA or TRITON track saw—but adds a second "parallel edge" to permit squaring against the front and back of your workpiece.
The Original (& Patented) Guide Rail Square
Thanks to feedback from the TSO user community, the GRS-16 PE embodies a number of requested features and refinements:
- Lighter than its predecessor despite being CNC machined from 25% thicker aluminum, with a mating vertical edge that now perfectly matches the height of your guide rail extrusion for maximum support and engagement
- Now fits in a Systainer—see our new Dual FoamPac Systainer Insert and limited edition TSO Blue Systainer3 M 112
- Latch hook now features a resilient coating to grasp and protect the edge of your guide rail
- Reshaped T feature lead-in makes it even easier to install onto your guide rail
- Accessory mounting holes tapped for M6 threads—enables connection to the TSO Parallel Guide System and Angle Accessory
- Adjustments to key tolerances to better accommodate production variances observed in guide rail manufacturing
- Fasteners used on all TSO brand tools are now metric for worldwide availability
- New, fully recyclable all-corrugated white packaging
See How It Works
Simple, Automatic Accuracy
Before the GRS-16 family, accessories for squaring up your track saw guide rail relied on the loose-tolerance T-slot found on just about every guide rail. To overcome this inherent inaccuracy, you had to rely on a separate reference square, plus a combination of loose parts like T-bars, hex bolts, knobs or wingnuts. No longer! The patented GRS-16 PE is completely self-contained and self-aligning, thanks to an innovative, high strength integral draw latch mechanism. Simply slide the GRS-16 PE onto your guide rail, lock the draw latch, and you're done. Five seconds to square.
Accurate cuts with your track saw often require using a screw clamp or quick clamp. For this reason, we've designed notches in both reference edges of the GRS-16 PE to accommodate popular clamps like the Festool Screw Clamp or Quick Clamp.
Built for a Lifetime of Service (or Longer)
The GRS-16 PE is precision CNC machined from a single piece of 5/8" (15 mm) thick 6061-T6 aluminum and then anodized for a non-marring, high durability finish. The high-strength draw latch is built from stainless steel—to resist rust and pitting 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. The GRS-16 is made in the United States, and comes with our five-year warranty.
So Which Tool is Right for You?
If you need the ability to reference off the front and back edge of your workpiece, select the GRS-16 PE (the product you see on this page). 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. Can't decide? Order both and enjoy special savings.
- Allows you to square both ends of longer rails for greatest accuracy
- Keep one in the truck and one in the shop
- Special savings when purchased together as a bundle (see bundle offer at top of page)
A System Approach
The GRS-16 PE is much more than a guide rail square; in fact, it's the foundation of a broader system of TSO Products designed for interoperability. Case in point: the TSO Parallel Guide System utilizes the M6 accessory mounting holes on the GRS-16 PE for attachment. Once connected, you can repeatedly square and rip multiple workpieces in a single operation.
We have added the ability to connect the GRS-16 PE to the MFT/3 guide rail hinge bracket! The time-consuming re-squaring process of the MFT guide rail is now a thing of the past with the newest GRS-16 PE. 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 acted on it. 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...
Already own a GRS-16 PE? We've got more good news!
Notice the M6 tapped holes in the right side – they line up and match the MFT/3 hinge bracket mounting holes. Connection and removal is a snap. In keeping with our policy of making new features backward compatible whenever practical, you can add this feature to your existing GRS-16 PE tool using instructions and a pattern available for free download from our “Plans” section right now. This feature is not technically possible for use on the GRS-16.
- 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 (Both): FESTOOL, MAKITA and TRITON (not compatible with FESTOOL HK 55 Carpentry Saws including the FSK 250, FSK 420 and FSK 670; not compatible with BOSCH or DEWALT tracks)
- 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
|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|
|Optional Add-ons||TSO Parallel Guide System
TSO Limited Edition Systainer³ M 112
FoamPack Storage Insert for T-LOC Systainer & Systainer³ M 112
Got a suggestion to make this page even better? Your feedback and suggestions are always welcome!
Other DetailsTSO 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 (firstname.lastname@example.org).
Videos Hide Videos Show Videos
TSO Products GRS-16 Guide Rail Square. Quick review.
TSO Products sent me the GRS-16 guide rail square and asked me...
New Release: GRS-16 Track Square
Damion Fauser, furniture designer/maker and Wood Review author...
GRS-16 Track Saw Guide Rail Square Review
Looking for a quick and accurate way to make square cuts with ...
One month review of my TSO Products GRS-16
I found thus company on the internet while searching for other...
Testing the TSO GRS-16 PE Square with the FESTOOL FS1400 Guide Rail
The friendly people at TSO send me their TSO GRS-16 PE. I cut...
An accessory tool for track saws that gives you perfect 90 deg...
Track Saw Guide Rail Square - Presenting the GRS-16 PE
In just seconds, transform your Festool, Makita or Triton bran...
144 Reviews Hide Reviews Show Reviews
WoW. I've read so much about this rail square I decided to order one. It is a pricey item but I am totally impressed with the quality and accuracy. I just popped it out of the box, slipped it on my festool track and I was ready to go. Now I don't know how I did without it for all these years.
A great help for cutting large pieces of wood. The precision is incredible. I recommend it. The best help I have in my workshop.
A nice product that’s well made and feels good in the hand. It is good to go right out of the box and square
I can't believe I waited so long to buy this! Making a square cut is so easy and fast now.
Very high quality item. I love the simplicity of it. Slide it on the rail, latch it. Done. Should have bought it right away.
A bit of an indulgent purchase for a DIYer, but I've learnt over the years that you can never go wrong buying top quality products. Couldn't be happier with the results when paired with my Makita tracksaw.
Brilliant! I keep finding more ways to use it (e.g., setting up a bridge saw).
Excellent product that is Super Easy to use and does what it is supposed to do. EXCELLENT PRODUCT....!
We are continually striving to improve our products based on customer input. While we make every attempt to keep our product pages up-to-date, know that the product you receive may reflect recent improvements and therefore differ slightly from the product depicted. We reserve the right to change specification of products without notice.