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 HD (Heavy-Duty) pocket holes. PLEASE NOTE: YOU MUST HAVE THE KREG CUSTOM POCKET-HOLE PLUG CUTTER JIG TO USE WITH THIS BIT.