1. Material: The setup bars are made of sturdy aluminum alloy, which are produced by CNC machine to protect router bits and saws. The setup blocks are anodized in bright colors with a smooth surface treatment to guarantee a long serving life. 2.High Precision: The gauge set block is machined within 0.001' accuracy. Each measuring block has different thickness, height, angle, depth, from 1/8', 3/16', 1/4', 5/16', 3/8', 7/16' to 1/2'. They can be used individually or stacked, there are hundreds of combinations to meet your different needs. 3.4 in 1 Measuring Tool Set: The router table gauge set can be used as a height gauge, a depth gauge, square stack gauge, and an angle gauge. It is a combination of traditional depth and height gauges and traditional building blocks. With one set of setup bars, your work will be done efficiently. 4.Easy to Read: This setup blocks are designed with unique brighter color and white laser carving labels on three sides. The clear writing never fades and is super easy to read, perfect for table saws, routers, and other cutting machines