The step on the top edge of each bar acts as a gauge to test the depth of your completed cuts.Bars are made from a soft aluminum which is designed to prevent damage to your router bit or saw blade if contact is made during setup.Unique design straddles the Router Bit or saw blade to allow compatible with more precise height adjustment.Step on the top edge of each setup bar acts as a gauge to test the depth of your completed cuts.Step on the end of each setup bar used to test the fence depth of a table saw blade or router bit.Made from a aluminum designed to prevent damage to your Router Bit or saw blade if contact is made during set up.[Product Name]: Table Saw Height RulerPurpose: Quickly set the height of the table saw bladeSet Up Bars come in a portable case with 1/8 inch , 1/16 inch ,3/32 inch ,5/32 inch ,3/16 inch , 7/32 inch,1/4 inch , 5/16 inch , 3/8 inch , 7/16 inch 15/32 inch,23/32 inch,3/4 inch,1x2x3 inch,& 1/2 inch bars.Material:Aluminum alloycolour:blackPackage Contents: 15 x Quick Router Table SetOnly the above package content, other products are not included.Note: Light shooting 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.