The each block has a different thickness in the 7pcs gauge block set. The thickness, height, and depth of each gauge are the same size. It can measure fixed depths, heights, or stack them by their thickness for a wide variation or sizes. Very flexible and practical. 4 gauge in 1. 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. Accurate setup block height gauge set sizes: 1/8inch, 3/16inch, 1/4inch, 5/16inch, 3/8inch, 7/16inch & 1/2inch. The gauge blocks can be used individually, stacked, there are hundreds of combinations, enough to meet your different needs. 7pcs miter gauge tool made of aluminum alloy, anodized with a finish can better protect your hands, router bits and table saw. The woodworking setup blocks with excellent laser carving labels, Clear never fades, which makes it easy to read. A storage case is included, so it's more protected during shipping. Colour:red Material:aluminum alloy Package Contents: 1 Set X Setup Blocks guage(7pcs) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.