Professional drill bit set for masonry, wood, metal and plastics. Carbide grade with innovative tip design and optimized milled flutes for fast, accurate drilling. Masonry bits are designed to produce concentric holes for better fixings fitting. HSS black oxide metal drill bits are precision-ground to an optimum 118° for rapid drilling and long life. Top quality, high strength chrome vanadium wood drill bits with center location brad point and sharp outer spurs give clean, accurate holes. A large range of the most commonly used sizes supplied in handy, pocket-sized containers Includes 3 sets DT4535-QZ Wood Set, DT5912-QZ Metal Set, DT6952-QZ Masonry Set 5 x Masonry drill bits (4, 5, 6, 8 and 10mm) 5 x Brad point wood drill bits (4, 5, 6, 8 and 10mm) 13 x Metal black oxide drill bits.