This DEWALT Extreme 2 Metal Drill Bit has the following specification: Tip Diameter: 4.1mm. Working Length: 43mm. Overall Length: 75mm. Pack Quantity: 1. The DEWALT Extreme 2 Metal Drill Bit is suitable for portable or stationary drilling of steel, alloyed and non-alloyed, up to 900N/mm. Particularly suited to drilling sheet or thin materials where accurate burr-free holes are required. Very effective in wood and plastic materials. The patented split pilot point design eliminates walking/slipping on contact.