Micro-sized pocket-hole cutter bit works with the special drill guide block (sold separately) 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 Kreg Custom Plug Cutter System that is sold separately to produce plugs in the correct diameter to fit Micro-Pocket Kreg Jig pocket-holes. PLEASE NOTE: YOU MUST HAVE THE KREG CUSTOM POCKET-HOLE PLUG CUTTER JIG TO USE WITH THIS BIT.