IEY1677 Features: * Drill bit * Fast spiral * For drilling in brick, cinder block, and tile * Double flute drills 2 times faster than standard masonry bits * Carbide-tipped for long life * For use in corded and cordless rotary drills only * 3/8"" shank * 11-1/2"" flute length * 13"" overall length Dimensions: * 1/2"" diameter