The Dial-A-Width Dado set performs like a stacked dado, but we have replaced the shims with a patented dial system and with our exclusive Dial hub, ensures accurate adjustments. Each click of the dial adjusts the blade by .004 in.. The Dial-A-Width dado set is easy to use, and very precise. For the serious woodworker, there’s nothing better. Adjusts in .004 in. increments. Maximum 29/32 in. cut width. Adjusts easily to right or left operating machines. Set includes 2 outside blades, 5 chippers, wrench and carrying case. Does not need shims.