1TABLE SAW GAUGE BLOCK With 5 different size height measuring blocks and 2 round hole gauges, the height of the knife can be easily set according to the needs. 2MULTI FUNCTION USE Stacked setup bars to get a wide range of changes or sizes, or use them alone to provide quick work and measurement. 3LASER ETCHING Each setting block has an easy to read laser etched labels, and the surface is black anodized, which is safe, durable, and corrosion resistant. 4ALUMINUM ALLOY MATERIAL Selected high quality aluminum alloy material, sturdy and reliable, suitable for table saw measurement and woodworking work. 5Setup blocks are all 21/2in long, diameter of 2pcs round block gauges diameter are 1/2in and 12mm, 5pcs square block diameter are 1/2in, 3/8in, 1/4in, 3/16in, 1/8in. Accuracy is 0.03mm (less than 2 mils=less than 0.05mm).5 x Square Setup Block2 x Round Setup Block