GRS-16: The Original 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. Incorporating a number of user-driven enhancements, the TSO GRS-16 guide rail square is still the fastest, easiest and most accurate way to square cuts with your FESTOOL, MAKITA and TRITON track saw guide rails.
Featuring New Enhancements
Thanks to feedback from the TSO user community, the GRS-16 guide rail square now 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
- 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
- Available Dual FoamPac Systainer Insert fits both the GRS-16 and GRS-16 PE in a single Systainer3 M 112 and previous-generation T-LOC Systainers (check out our limited edition TSO Systainer3 M 112)
- 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, 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 is completely self-contained and self-aligning, thanks to an innovative, high strength integral draw latch mechanism. Simply slide the GRS-16 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 or quick clamp. For this reason, we've designed notches in both reference edges of the GRS-16 to accommodate popular clamps like the Festool Screw Clamp or Quick Clamp.
Built for a Lifetime of Service (or Longer)
The GRS-16 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 guide rail square is made in the United States, and comes with our five-year warranty.
So Which Tool is Right for You?
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 (the product you see on this page). If you need the ability to reference off the front and back edge of your workpiece, select the GRS-16 PE. Can't decide? Save by ordering both at once:
- 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 offer at the top of this page)
A System Approach
The GRS-16 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 for attachment. Once connected, you can repeatedly square and rip multiple workpieces in a single operation.
- Dimensions: 15.2 x 6.0 x 1.4 inches (385 x 152 x 36 mm) - click here for dimension drawing
- Weight: 1.7 lbs (772 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
Download the GRS-16 series User Guide
Access the User Guide PDF on our Support page.
Quick video walkthrough of the original GRS-16.
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
|GRS-16 PE |
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 an idea 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...
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Woodpeckers made a huge error in selling me this $120 square.
I used to drool over all these red Woodpecker squares you see ...
184 Reviews Hide Reviews Show Reviews
it Works vary well and easy to use I'm pleased with the tool.
The GR-16 has cut the time I previously spent breaking down sheet goods considerably. I use to use one of the “Red Brand” large squares to line up my track. Now it’s just put the track on the mark and go. Perfectly square cuts each and every time.
It arrived on time and it’s perfectly square on my makita track.
This rail square worked out Great. I'm very glad to make the purchase.
This is a great product. I used it with my Powertec rails and it fit perfectly. Rail was held extremely secure and the cut made was 90 degrees by my woodpeckers square. The finish was top notch and this should last for years. It will give anyone the ability to make good cuts if they do their end of the job. I will be looking to TSO for more products in the future. The TSO staff was great to deal with and have earned my business. Thanks TSO.
This square is dead on . It takes so much time to get perfect cuts with mft table and the whole guide rail system. This just attach to guide rail and your golden. 90 degree cuts all day long . Wish I hadn’t waited so long big time saver
I researched on the web and watch Youtube videos on many different brands of rail squares. I kept coming back to the TSO square, not only for the reviews, but also the quality of the product. I ordered the GRS-16 and was not disappointed. The packaging was superbly done. Fit and finish is excellent. I played with it on some scrap ply and it worked flawlessly. I am looking hard at their parallel system as well. If that product is made as well as this square, I sure I won't be disappointed.
get one! at least
Really glad I got this. Makes setup very easy.
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.