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Guide Rail Squares

Guide Rail Squares from TSO Products
Fastest way to square cuts with your Festool, Milwaukee, DeWalt, Makita, Kreg & 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

Since its initial release over seven years ago, the GRS-16 Guide Rail Square has become an essential companion to the track saw for two big reasons: accuracy and efficiency. With the GRS-16, you can break down sheet goods much faster while ensuring perfect 90° cuts every time. So what makes the GRS-16 the best tool of its kind?

  • Born Square: All GRS-16 squares feature a single-piece design that self-squares to 90° with no adjustments needed (and therefore, no points of failure in the future)
  • Rock-Solid Attachment: Super strength, custom draw latch features a resilient coating to grasp the edge of your guide rail and prevent marring
  • The Perfect Form Factor: Lightweight design that balances perfectly once attached to your guide rail, and compact enough to fit into a Systainer (with optional Foam Insert available)
  • Expandable: Accessory mounting holes enable connection to the TSO Parallel Guide System and Angle Accessory
  • Wide Compatibility: We now offer a GRS-16 model compatible with most popular track saw systems, including Festool, Milwaukee, DeWalt, Makita, Kreg and Triton

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 family solves this problem with a simple one-piece design that self-squares as it attaches to the guide rail. Once connected, the GRS-16 becomes a rigid extension of your guide rail, providing a precise 90° reference edge (or two, in the case of the GRS-16 PE) that won’t fall out of square over time.

TSO Guide Rail Square Comparison Table

  GRS-16
Guide Rail Square
GRS-16 PE
Guide Rail Square
GRS-16 PE D
Guide Rail Square
GRS-16 PE K
Guide Rail Square
  GRS-16 GRS-16 PE GRS-16 PE D GRS-16 PE K
Fits guide rails from… Festool, Makita, Powertec, Triton Festool, Makita, Milwaukee, Powertec, Triton DeWalt 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 Squaring your guide rail by referencing off either the front or back edge of your workpiece
MSRP $179.95 $189.95 $169.95 $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