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TSO Products, Nexgen Small Angle Accessory, for Guide Rail Squares

by TSO
R 339.90
SKU TSO61-245

The TSO Products 178mm Angle Accessory is fully compatible with the TSO GRS-16 and  TSO GRS-16PE Guide Rail Squares , as well as the TSO MTR-18 Precision System Triangle. 

The 178mm Small Angle Accessory extends the usefulness of your tools. When used with the TSO GRS-16 or TSO GRS-16 PE, the angle effectively extends the reference edge of your square to address challenging applications. When used with the TSO MTR-18, the angle can be clamped to square the interior of a cabinet or confirm squareness in many different glue-up/assembly scenarios.

If you frequently cut workpieces with edge details like chamfers, radii or other profiles, you may find the reference edge of the guide rail square isn't quite thick enough to rest against the true edge of your workpiece. To solve this dilemma economically, TSO Products have created a simple solution: a precision aluminium angle that attaches to the accessory mounting holes on either the GRS-16 or the GRS-16 PE Guide Rail Squares.

Once attached, the effective thickness of the guide rail square is extended to 47.6mm thick and the effective reference edge length extends up to 552mm (Depending on which length Angle Accessory you use), allowing you to quickly achieve accurate cuts on otherwise difficult-to-square workpieces.

You are also able to transform your TSO MTR-18 Precision System Triangle into a large, extremely accurate clamping square by adding two Angle Accessories. Easily square a cabinet during glue-up, or hold a mitre joint or butt joint at a perfect 90 degrees. Once attached to the face of the MTR-18 Precision System Triangle, the Angle Accessory provides a generous 34.9 mm of clamping surface.

The TSO Small Angle Accessory is available in two sizes: small 178mm and large 381mm long . When used with the TSO GRS-16 family, both angles are effective at extending the depth of your guide rail square but the larger size is better if you are working with edges that feature natural variation (e.g. live edges), and the added reference edge length makes your cuts even more accurate. When used with the MTR-18, both sizes work really well, however the large size does provide more real estate for clamps.

The TSO Small Angle Accessory includes two stainless steel socket head screws for mounting to your guide rail or triangle.The TSO Angle Accessory is also compatible with the previous versions of both the GRS-16 and GRS-16 PE. If you are not sure if your model supports the Angle Accessory, look for the accessory mounting holes on either side of the GRS-16 label, measuring 100mm apart on centres.

The Small Angle Accessory is not compatible with the TSO PTR-18 Precision Basic Triangle as it lacks the appropriate mounting holes.


  • Dimensions: Short Angle Accessory - 178mm x 25.4mm x 38mm

  • Dimensions: Long Angle Accessory - 381mm x 25.4mm x 38mm

  • Material: Aluminium Alloy 6000 Series

  • Mounting Hardware: Two M6 stainless steel socket head screws

    Special thanks to Eric at The Poplar Shop for his unexpected video review of the original GRS-16!