MLCS 8371 Stackable Adjustable Slot Cutter Router Bit Set with 1/2" Shank Cut Grooves for Dadoes, Tongue and Groove Joints, Rabbets, or Biscuit Joints. Cuts Almost Any Groove Size from 1/16" to 11/16". 6 Slot Cutters, Shims, Bearing, and 1/2" Arbor Included Wood Storage Box Included MLCS Quality