Made from a soft aluminum designed to prevent damage to your Router Bit or saw blade if contact is made during set up. Unique design straddles the Router Bit or saw blade to allow for more precise height adjustment. Versatile Applications: Compatible with various machinery such as table saws, band saws, and planers, these gauge blocks allow for height, depth, and angle measurements, as well as assist with drilling. Step on the end of each setup bar used to test the fence depth of a table saw blade or router bit. Compatible with various machinery such as table saws, band saws, and planers, these gauge blocks allow for height and depth measurements and assist with drilling., Manufacturer: IULGFSC