Insty Bit Quick Change Drilling Systems Drill Adapter Set With Bit & Allen Wrench (4 Piece) Set: 5/64", 7/64", 9/64", 11/64" Replaceable HSS drill bits. Good for drilling wood, metal and plastic 1/4" power groove shank. See View Detail for included sizes. To see the whole collection, Search: Insty Bit Quick Change Drilling System