General description A pack of 10 general purpose 4.2mm TiN (titanium nitride) coated HSS standard twist drill bits, ideal for use on softer metals, wood, and plastic. The TiN coating extends the drill bit life and allows it to be run faster than standard HSS drill bits. Technical specifications Diameter: 4.2mm Material: TiN coated high speed steel Point type: 118° point Standard: DIN 338 Usage Suitable for general purpose applications, including: copper, iron, magnesium, mild steel, wood, and plastic. Other information Part of a range of HSS TiN coated drill bits in metric sizes from 1.0mm - 13.0mm (Part Nos. 32965 - 32992).