The Faithfull Lip & Spur Wood Drill Bits are the preferred cutting tip design for drilling wood, chipboard and MDF. This alloy steel drill has a steeper twist and a deeper flute than HSS bits for rapid clearance of waste. Ideal for use in dowelling jigs.This Faithfull Lip & Spur Wood Drill Bit has the following specification: Diameter: 4mm.Working Length: 43mm.Overall Length: 75mm.