... of drills, and drill set with different style, combined drill set of different application 18pcs combination drill set 6pcs HSS twist drill 1/8, 5 ... /32, 3/16, 15/64, 5/16, 3/8 6pcs wood working drill 1 ... , 3/16, 15/64, 5/16, 3/8 6pcs masonry drill 1/8, 5/32, 3/16, 15/64, 5/16 ...