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SPIRAL FLUTE - Three high-speed HSS 5% cobalt spiral flute step drills. SWARF CLEARANCE - Double spiral flutes for efficient swarf clearance. PRECISION - Allows clog-free, precision drilling of 18 different size holes with just three bits. SIZES #1: Ø4-12mm, #2: Ø4-20mm in 2mm increments, #3: Ø4-32mm in 2mm increments. STORAGE - Supplied in storage case.