Q: What does a guide rail square do?
It mounts to a track-saw guide rail and converts it into a large try square, giving an accurately square surface to register against the edge of your work.
86N5402 - GRS-16 PE Guide Rail Square

Much like the GRS-16 model, this attachment greatly improves speed and accuracy when making square cuts with a track saw. Easily mounted to a Festool track-saw guide, it essentially converts your guide rail into a large try square, providing an accurately square surface to register against the edge of your work.
But unlike the single-face GRS-16, this version has two machined reference faces, so it can be used on either the front or back edge of a panel, useful when cutting panels with profiled or bevelled edges, or in other situations where the front edge of the panel cannot be used for reliable registration.
It simply fits into the T-slot on the underside of the rail and locks firmly in position using an integral draw clamp, which hooks onto the lip on the edge of the rail and pulls the guide rail square tightly against it. The CNC-machined anodized aluminum body provides a 15 3/4" long, 5/8" thick registration surface for a reliable 90° reference against a panel edge, and has a small notch in the underside to accommodate a track-saw guide clamp.
For breaking down sheet goods or other applications where the square is registered on the front edge of a panel, you can hook your thumb into the cutout in the body to brace the square snug against your work throughout the cut, and the low-profile body won’t obstruct your movement.
Compatible with Festool track-saw guides as well as those made by Triton, Makita, Powertec and Milwaukee. Made in USA.
Not available for shipment to Québec.
It mounts to a track-saw guide rail and converts it into a large try square, giving an accurately square surface to register against the edge of your work.
The single-face GRS-16 registers on one edge only. This version has two machined reference faces, so it can be used on either the front or back edge of a panel.
It helps when cutting panels with profiled or bevelled edges, or in other situations where the front edge of the panel cannot be used for reliable registration.
It fits Festool track-saw guides as well as those made by Triton, Makita, Powertec and Milwaukee, dropping into the T-slot on the underside of the rail.
An integral draw clamp hooks onto the lip on the edge of the rail and pulls the guide rail square tightly against it.
The registration surface is 15 3/4" long and 5/8" thick.
Yes, a small notch in the underside accommodates a track-saw guide clamp.
The guide rail square is made in the USA.
| Materials | Aluminum body |
| Dimensions | 15 3/4" long × 5/8" thick registration surface |
| Compatibility | Fits Festool track-saw guide rails as well as Triton, Makita, Powertec and Milwaukee rails; drops into the T-slot on the underside of the rail |
| Includes | Guide rail square |
| Package Quantity | 1 item |
| Country of Origin | USA |
| Warranty | Lee Valley Satisfaction Guarantee |

Options:
Variations:
GRS-16 PE v2 Guide Rail Square
Much like the GRS-16 model, this attachment greatly improves speed and accuracy when making square cuts with a track saw. Easily mounted to a Festool track-saw guide, it essentially converts your guide rail into a large try square, providing an accurately square surface to register against the edge of your work.
But unlike the single-face GRS-16, this version has two machined reference faces, so it can be used on either the front or back edge of a panel, useful when cutting panels with profiled or bevelled edges, or in other situations where the front edge of the panel cannot be used for reliable registration.
It simply fits into the T-slot on the underside of the rail and locks firmly in position using an integral draw clamp, which hooks onto the lip on the edge of the rail and pulls the guide rail square tightly against it. The CNC-machined anodized aluminum body provides a 15 3/4" long, 5/8" thick registration surface for a reliable 90° reference against a panel edge, and has a small notch in the underside to accommodate a track-saw guide clamp.
For breaking down sheet goods or other applications where the square is registered on the front edge of a panel, you can hook your thumb into the cutout in the body to brace the square snug against your work throughout the cut, and the low-profile body won’t obstruct your movement.
Compatible with Festool track-saw guides as well as those made by Triton, Makita, Powertec and Milwaukee. Made in USA.
Not available for shipment to Québec.