Description
Square Cuts Made Fast and Easy with Your Track Saw
Breaking down sheet goods is easy with a TSO Guide Rail Square in your shop. This must-have track saw accessory turns your guide rail into a large, precision square, enabling fast and accurate 90-degree crosscuts with less setup time, less marking, and fewer errors.
The GRS-16 PE v2 Guide Rail Square is perfect for crosscuts on sheet goods and is compatible with Festool, Makita, Milwaukee, Powertec, Triton, and WEN track saw systems.
Key Features
- Born Square: A proven design, CNC-machined from a single block of 6061-T6 aluminum, will never require fine-tuning or calibration.
- Work Faster: No need to scribe your cutting line; make a small tick mark at your desired cutting position, align the guide rail, and you're ready to start cutting.
- Fewer Errors: Cut your marking and measuring in half, and with it, your chances of making a mistake that costs you valuable time and materials.
- Parallel Edge: Reference your work from the front or back edge to fit your workflow.
- Solid Connection: A resilient latch coating grasps the guide rail and protects it from damage.
- Drop-on Convenience: Quickly attaches without the need to remove accessories, like hose deflectors, track connectors and clamps.
- Clamp Compatible: Notches on both reference edges provide room for your favorite track clamp. Including the Festool Screw Clamp (489570), Ratcheting Clamp (491594), and Axminster guide rail clamps.
- System Approach: Compatible with the TSO Parallel Guide System for making repeatable square and parallel cuts in one workflow.
- Anodized Blue: Provides a beautiful, durable, and non-marring finish.
- Made in the USA: Designed, manufactured and hand-assembled in Eagan, Minnesota.
See How It Works
Read our Guide Rail Square User Guide to learn about proper use and maximizing its benefits for your woodworking projects.

Trusted by Experienced Woodworkers
TSO Guide Rail Squares are highly praised by professional cabinet shops to seasoned woodworkers and discerning hobbyists. Here’s what real customers have to say:
“Easy to attach, solid & square!” – Wallace, Feb. 2024
“Very precise and worked perfect right out of the box.” – Ronnie, Jan. 2024
“Speechless. So simple and effective. Great design.” – Greg, Mar. 2024
“…performs as good or better than a table saw without the hassle! A portable cabinet shop!” – Ronald, Jan. 2024
“Although this was a splurge I cannot imagine not having it. Perfect every. single. time.” – Teri, Mar. 2024
“Has saved me from messing up a bunch of cuts. Would highly recommend.” – Gary, Aug. 2023
“Love the ‘quick connect' feature.” – Bryan, Oct. 2024

Compatible Accessories
- Protect your Investment: Store two TSO Guide Rail Squares in a Systainer Foam Insert compatible with our custom TSO Systainer³ M 112.
- Expanding the Reference Edge: Attach our Angle Accessory for a deeper (or longer) reference edge. Perfect for cutting rounded profiles.
- Make Perfectly Parallel Rip Cuts: Attach the TSO Parallel Guide System to completely eliminate the need to measure and mark before most cuts.
- Secure Your Work: With Axminster guide rail clamps.
Guide Rail Squares Fitting Other Brands
- GRS-16 PE D: Fits DeWalt
- GRS-16 PE K: Fits Kreg ACS
- GRS-16 PE R: Fits Ridgid
- GRS-16: Fits Festool, Milwaukee, Makita, Powertec, Triton, WEN
Technical Details
- Dimensions: 15.2 x 6.0 x 1.4 in. (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, Triton and WEN.
- Not compatible with Festool HK 55 Carpentry Saws including the FSK 250, FSK 420 and FSK 670.
- Not compatible with Bosch, DeWalt, Ridgid or Kreg tracks. (See other models.)
- 5-Year Warranty: Your TSO Guide Rail Square is guaranteed to be free of defects in materials or workmanship.
- Patented Innovation: Protected by U.S. patents 10,363,681; 10,434,678; 12,017,318 and Canadian patent 2,994,319.
Documentation
Videos
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Upgraded GRS-16 PE v2 Guide Rail Square with Faster, Drop-on Attachment
In just seconds, transform your Festool, Milwaukee, and Makita...
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Cross-Cutting with the GRS-16 and TSO Parallel Guide System
Here's a compact and precise way to achieve repeatable, identi...
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Track Saw Guide Rail Square - Presenting the GRS-16 PE
In just seconds, transform your Festool, Makita or Triton bran...
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TSO Products GRS-16 Guide Rail Square. Quick review.
TSO Products sent me the GRS-16 guide rail square and asked me...
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New Release: GRS-16 Track Square
Damion Fauser, furniture designer/maker and Wood Review author...
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GRS-16 Track Saw Guide Rail Square Review
Looking for a quick and accurate way to make square cuts with ...
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One month review of my TSO Products GRS-16
I found thus company on the internet while searching for other...
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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...
Warranty & Returns
258 Reviews
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Fast, simple, accurate, easy, fits Festool and Makita tracks
Prompt shipping. Robust packaging. Product arrived in perfect condition. Installs in seconds. No instructions needed. One click and it clamps anywhere along the length of the track. No adjustment needed. Locks securely. Using a VERY sharp pencil, I found it agrees with my Starrett framing square with zero deviation along the long leg. Did the flip test after cutting a four foot section or BB ply. Dead nuts perfect! :-) Using Incra marking squares, was able to verify accuracy to within one-thou over 5 feet! That's damn good and I'm pretty damn happy! This is by far the easiest solution for square reference on most track saws. Festool should be embarrassed they didn't include this. This fits my Festool AND Makita tracks. The only caveat is this does NOT fit my Mafell tracks, but that is a non-issue since Mafell makes their own square. This is actually just as accurate as my Mafell square, but MUCH easier to install and use. MADE IN USA! Highly recommended! Everyone should support great American products like this and I wish TSOproducts the best. I'll be barkin' like a show dog about this valuable accessory! Buy your own because you're not getting mine! ;-))))))))))
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Have confidence with 90 degree guide rail cuts.
It's very hard to fault this guide rail attachment. It locks on at exactly 90 degrees and there is absolutely no movement. It is precision machined, feels very solid and fits my Festool guide rails perfectly.
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Works perfectly, solid and heavy duty
It attaches to the rails perfectly, connects firmly and aligns square every time. I rarely ever take it off my Festool 108 rail. My only gripe really is not really a gripe. The color is blue so I guess its fine with my Makita or Bosch, but the fact remains I use it mostly with my Festools and I am guessing 80% to 90% of the people that buy this use Festool. I would love to get this in Green.