Milwaukee 48899399 3 Piece Step Drill Bit Set (4mm – 12mm / 4mm – 20mm / 6mm – 35mm)

Step Drill are the best option for enlarging existing holes. More durable than twist drill bits, with a thick core, which resists breakage. For clean burr free holes, less reaming required. Drills plastic without splitting or cracking. Ideal for the following trades/application; Electrical: drilling of panels and cabinets for cable gland installation, plumbing / hvac: access holes for pipework and installtion, metal workers / fabrication: various sizes and hole enlargement, automotive: holes for cable installation (mobile telephones, antennas, re-directing electrical wiring), maintenance repair operations: various applications, sizes and hole enlargement. Step drills are ideal for drilling into the following materials; ferrous & non-ferrous sheets metals, profiles and pipes, copper, brass and aluminium, stainless steel, plastics, maximum material thickness 4 mm, to ensure best lifetime we recommend the use of a coolant.Features and Benefits:Spot drill – Drill – Debur – All in one goRapid Strike tip for improved centring – less walking and fast drilling without the need to punch or pre drill the material.Special tip and step geometry for jam-free performance – less risk of drill snagging when used with high speed cordless tools and also prevents deformation of the drilled material.Optimised 2 flute ground sharpened edge geometry for 2 x faster and smoother cutting.Produced from custom engineered steel with black oxide coating for 4 x longer life.Optimised for use with high speed cordless drills.Laser engraved size markings for best long term visibility.Each step is relief ground to drill and deburr automatically.With 3 flat secure grip to prevent step drill from slipping in the chuck and ensure maximum transmission of torque.Technical Specification:Pack Qty ea. – 3Size – Ø4-12:No. of steps – 7Overall length (mm) – 65Shank diameter (mm) – 6Size – Ø4-20:No. of steps – 9Overall length (mm) – 65Shank diameter (mm) – 8Size – Ø6-35:No. of steps – 14Overall length (mm) – 90Shank diameter (mm) – 10