Inton HINGE DRILL BIT SET (7pc) Includes one of each:5/64", 7/64",9/64"11/64"13/64" ,1/4" ,5mm 1/4"Hex shank High speed steel drill bits, brass body, steel shank Three popular sizes to drill through metal, plastic, wood and more. These self-centering drill bits put hinges right where they should be--in the center.