RSA100 Mini Rafter Square

£55.99 £69.99

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Compact, precise and robust. We've packed several design features from our RSA Rafter Squares into the brand-new RSA100 Mini Rafter Square. Lighten the load without compromising on features with this versatile pocket-sized option to our 180mm or 300mm rafter squares. It's an ideal hybrid option between a rafter and a trim square too with scribe notches every 1mm for precision work.


  • 114mm and mini ruler
  • Hip/Valley and Common Rafter Scales
  • Curved Scribe Notches every 1mm
  • Protractor Scale
  • CNC Machined T6 Aluminum plate
  • 45-degree cutaway for weld build-up and internal radius
  • Anodised protective seal
  • Perpendicular and Birds Mouth line

CNC machined from high-quality T6 European aluminium plate, the RSA100 is a sturdy and robust little tool.

The face has a 15 micron+ thick anodised surface (this thick coating is not usually found on lower-priced tools) and is mated to the two-part machined aluminium fence using stainless steel fixings.

The fence has a 45-degree chamfer removed from the corner near the pivot point so that the RSA100 mini can be used on steel box section, especially where welds may build up in the corners.

The RSA100 includes notches every 1mm allowing for ultra-precise and simple scribing using various types of pencils or markers (odds on one side and evens on the reverse thanks to the stepped heel design).

There's also a handy degree gauge running along the hypotenuse edge that has been calibrated to the inside pivot edge of the fence.

Overall the RSA100 is a great addition and example of the craftsmanship and engineering that TrigJig tools are renowned for.

*Our tools are all small batch made and the anodising dye a natural product. As such, slight differences in the shade of blue can occur between batches.