This 19-piece set of Black Bronze oxide coated HSS drill bits offers superior durability, corrosion resistance, and enhanced cutting speed. The black oxide finish ensures a longer life and reduced friction, making these bits ideal for a variety of materials. Black Bronze Oxide Coated : Provides resistance to rust and corrosion, extending bit life by up to 50% compared to standard HSS bits. High Heat Resistance : Bits are heat-treated to 950F, enhancing durability and reducing friction. Versatile Use : Ideal for drilling hard and soft metals including aluminium, stainless steel, mild steel, copper, and brass. Also suitable for wood, MDF, PVC, polycarbonate, acrylic, ABS, nylon, and composites. Sizes : Includes drills in sizes from 1.0mm to 10.0mm in 0.5mm increments. Storage : Supplied in a sturdy plastic case with a barcode and euro hook hanger. Brand : PTI