One more practical CMT solution for making box and finger joints on wood easily and quickly. This set contains two identical blades featuring 24 teeth and 5/8? bore, offering the distinctive advantage to produce 1/4? grooves by using only a single blade, but also to extend the groove to 3/8? thickness by laying the two blades upon each other, with no setting and shims needed. The set highlights: -excellent and precise cut on soft and hardwood for fine joinery; -only one cutter is necessary for producing 1/4? thick grooves, no longer two; -3 shims for adjustment after re-sharpening; -you will need to lay two cutters upon each other for making 3/8? grooves; -long-lasting performance. U.S. Patent n. D621155.