Guide Rail Squares

Guide Rail Squares from TSO Products
There's no quicker way to square your FESTOOL®, KREG®, MAKITA® & TRITON® track saws

The GRS-16 family is the easiest, fastest and most accurate way to square your guide rail.

The Original, Patented Guide Rail Square

Thanks to feedback from the TSO user community, the GRS-16 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 redesigned for even stronger grip, while protecting the edge of your track saw guide rail 
  • Reshaped T feature lead-in makes it even easier to install onto your guide rail
  • Additional accessory mounting provisions included—see our new Angle Accessory and stay tuned for some exciting new products building off the GRS-16 platform
  • 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 or previous-generation T-LOC SYS1 systainer
  • Fasteners used on all TSO brand tools are now metric for worldwide availability
  • New, fully recyclable all-corrugated white packaging

Simple, Automatic Accuracy

Before the GRS-16 family, track saw 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 or GRS-16 PE onto your track saw guide rail and lock the draw latch, and you're done. Five seconds to square.

Once secured to your guide rail, squareness can be quickly verified by observing the zero-clearance attachment between the square and guide rail. Despite its high clamping strength, your track saw guide rail is completely supported by the straight-edge of the GRS-16, eliminating any potential for track deformation over time. An ergonomic handle makes it easy to lift and reposition the square along your length of track, and machined chamfers improve comfort and handling. Engineered for maximum accuracy and ease of use, the GRS-16 and GRS-16 PE are precision CNC machined from a single piece of 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. Both the GRS-16 and GRS-16 PE guide rail squares are made in the United States, and come 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. If you need the ability to reference off the front and back edge of your workpiece, select the GRS-16 PE. Can't decide? Get special savings when you order both guide rail squares at the same time and get the best of both worlds:

  • 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 at the same time (see product pages for details)

TSO Guide Rail Square Comparison Table

Guide Rail Square
Guide Rail Square
Guide Rail Square
  GRS-16 GRS-16 PE GRS-16 PE K
Fits guide rails from… Festool, Makita, Triton Festool, Makita, Triton Kreg
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 Squaring your guide rail by referencing off either the front or back edge of your workpiece
Price $179.95 $189.95 $189.95
Optional Accessories TPG Parallel Guide System
TSO Limited Edition Systainer with GRS-16 Foam Inserts
FoamPack Storage Insert for Systainer3 M 112 and SYS-1 T-LOC Systainers
Angle Accessory


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The TSO Products GRS-16 is protected by US Patent 10,363,681 and Canadian Patent 2,994,319.
TSO Products reserves the right to change specification of products without notice. Standard equipment and specifications may differ from country to country. Some products published here may not be sold in your country. Printed materials may not be current, so always check the TSO Products website for the most up-to-date product information.
FESTOOL is a Trademark of FESTOOL Tool Technic Tanos.
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