Step Drill Bit
Pilot D x Large D x Pilot Length x Flute Length x Overall
Made of HSS these Step Drills have a 90° flat step for pan head screw and 45° taper step for countersink head screw. Use a 3/8" or 10mm stepped drill bit with pilot hole for any standard #8 gauge wood screws. All sizes are 6" (150mm) overall length.