Slot Cutting Bit SetA slot cutting bit makes cutting joinery a breeze. You can make grooves, stub tenons, rabbets, as well as spline slots for reinforcing (and aligning) panel glue ups and miters. This set includes 2 bits in either 1 4" or 1 2" shank sizes with a router technique e book for learning how to do more with your router. 1 4" Shank Bit Set Includes: 1 8" Slot Cutter: 1 8" Kerf, 1 7 8" Diameter, 1 2" Cut Depth 1 4" Slot Cutter: 1 4" Kerf, 1 7 8" Diameter, 1 2"