1Aluminum Alloy Material: Made of high quality aluminum, the surface is black anodized, which will not damage the milling cutter and saw blade. 2More Acurrate: Heights of fences, blades and other knives can be set as desired, faster and more accurate than using a combination ruler. 3Stack at Will: There are 5 different sizes of height measuring devices and 2 hole gauges in the set, you can use them at will to complete your work. 4Easy to Read: Easy to read scale labels are engraved on each woodworking block to facilitate clear readings for your convenience. 5Essential Tools for Woodworking: This woodworking gauge block has high hardness, wear resistance and long service life. It is very suitable for woodworking.