Kreg PRS3400 Precision Router Table Set Up Bars, Set of 7 Set Up Bars come in a portable case with 1/8", 3/16", 1/4", 5/16", 3/8", 7/16" & 1/2" bars 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 for 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 soft aluminum designed to prevent damage to your Router Bit or saw blade if contact is made during setup