The Custom Plug Cutting Bit Works With The Custom Pocket Hole Plug Cutter To Create Plugs That Perfectly Match Your Project. This Specially Designed Bit Chucks Into Any Drill, And Fits Into The Hardened Steel Drill Guide In The Plug Cutter To Produce Plugs In The Correct Diameter To Fit Kreg Jig&Reg; Hd (Heavy Duty) Pocket Holes.