HSS Metric Drills 1/16 drill 5/64 drill 3/32 drill 7/64 drill 1/8 drills 9/64 drill 5/32 drill 11/64 drill 3/16 drill 13/64 drill 7/32 drill 15/64 drill 1/4 drills 17/64 drill 9/32 drill HSS 19/64 drill 5/16 drills 21/64 drill 11/32 drills 23/64 drill 3/8 drills 25/64 drill 13/32 drill 27/64 drill 7/16 drill 23/64 drill 15/32 drill 31/64 drill 1/2 HSS drill