AUTOTOOLHOME 1/4" Hex Shank Hinge Self Centering Drill Bits Woodworking Window Doors Hole Saw 5/64", 7/64",9/64"11/64"13/64",1/4" 5mm Set of 7 These self-centering drill bits put hinges right where they should be--in the center. nique design and perfect punch effect.Applicable for the installation of the door hinge. Easy to use and install, change bits fast which one-handed load and release. They come in the 3 most common hinge screw sizes 7/64",9/64", 11/64".The 7/64" is good for drilling holes in smaller hinges and hardware like decorative boxes,9/64" is ideal for medium to full size hinges and hardware, 11/64 is perfect for door hinges, gate locks and all large hardware. Perfectly center the pilot hole for hinges, drawer guides, handles, etc. Hex Shank fits all quick change chucks like those found of 1/4 Hex Shank impacts