Subland twist drills

Subland drills or step drills for creating countersunk through holes or countersunk tapping holes for screw seats: with a 90° countersink for standard metric countersunk head screws, with a 180° countersink for standard metric cylindrical head screws. Available with a cylindrical or Morse taper shank, with a polished or steam-blasted finish, suitable for both conventional and CNC machine tools, for drilling most metals. Fine-grade drills are suitable for precision screws/bolts, medium-grade drills for standard mechanics.