Woodpeckers 851 square packs the features of their best-selling 1281 into more compact size. Unlike most squares on the market, the 851 has a one-piece central core which is precisely machined to be within ±.0085° of 90°. On both sides of that central core, Woodpeckers pin precision-machined cheeks flush with the base and 1/4" (6.35mm) back from the inside edge. This forms a shoulder that keeps the square registered to your material without you holding it in place. Whether you're setting up machines, laying out joinery or checking parts as they go together, the 851 square is the one you want for every step of your project.
The metric scales on the 851 are laser engraved to a tolerance of 0.1mm (0.004") total accumulated error over the length of the blade. The outside scale is ideal for setting tooling heights. The inside scale gives you a perfect zero reference from the edge of your stock.
Each square comes with a wall-mountable MDF case to keep your Precision Woodworking Square right in plain sight and always ready to go to work.