• Three high-speed HSS 4341 double spiral flute step drills.• Double spiral flutes for efficient swarf clearance.• Allows clog-free, precision drilling of 18 different size holes with just three bits.• Size #1: ø4-12mm.• Size #2: ø4-22mm in 2mm increments.• Size #3: ø4-30mm in 2mm increments.• Supplied in flip-up metal case.Three high-speed HSS 4341 double spiral flute step drills. Double spiral flutes for efficient swarf clearance. Allows clog-free precision drilling of up to 18 different hole sizes. Supplied in flip-up metal case.• Three high-speed HSS 4341 double spiral flute step drills. • Double spiral flutes for efficient swarf clearance. • Allows clog-free precision drilling. • Size #1: ø4-12mm. • Size #2: ø4-22mm in 2mm increments. • Size #3: ø4-30mm in 2mm increments. • Supplied in flip-up metal case. • Model No. AK4749Technical Specification:Nett Weight: 0.49kgSize 1: ø4, 5, 6, 7, 8, 9, 10, 11, 12mmSize 2: ø4, 6, 8, 10, 12, 14, 16, 18, 20, 22mmSize 3: ø4, 6, 8, 10, 12, 14, 16