General description A pack of 5 general purpose 1/2" HSS standard twist drill bits, ideal for use on softer metals, wood, and plastic. Technical specifications Diameter: 1/2" Material: High speed steel, roll forged Standard: DIN 338 Usage Suitable for general purpose applications, including: Aluminium Copper Iron Mild steel Wood Plastic Other information Part of a range of jobber drill bits in metric & imperial sizes from 1.0mm - 13.0mm (Part Nos. 32900 - 32927) & 1/16" - 1/2" (Part Nos. 32932 - 32960).