Step Drill Bit, 3/16-Inch to 7/8-Inch Click HERE for more information! STEP DRILL #4 3/16-7/8" 12 SZ. STEP DRILL #4 3/16-7/8" 12 SZ. STEP DRILL #4 3/16-7/8" 12 SZ. STEP DRILL #4 3/16-7/8" 12 SZ. STEP DRILL #4 3/16-7/8" 12 SZ. Save time because you don't need to change drills for different-sized round holes in thin materials. Each drill acts as a pilot for the next size. Made from industrial-grade high-speed molybdenum steel heat treated for maximum durability. SpeedPoint tip penetrates faster and prevents walking.