Each setup block has a different thickness, and the thickness, height and depth of each gauge block are the same size. It comes with 7 precision setup blocks that can be combined to achieve different measurements. Set the height of your fence, blades, bits and other in a fraction of the time. 4 in 1 Design-The woodworking Setup Bars can be used as a height gauge, depth gauge, square stacking gauge and an angle gauge. It is a combination of traditional depth and height gauges and traditional building blocks. Precision Gauge Block Set-Whether you're measaure your table saw blade or router, you will obtain high-precision measurement values. Router Table Set Up Bars are precise to 0.001-0.004inch.Height Gauge Set sizes: 1/8inch, 3/16inch, 1/4inch, 5/16inch, 3/8inch, 7/16inch & 1/2inch. Solid Durability Gauge Bars-Solid aluminum alloy material and anodized with a finish can better protect your hands, router bits and table saw, also have a long service life. Color: Blue Material: aluminum alloy Package Contents: 7 x setup blocks 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.