Facom 90 Degree Cone Bit Set for Countersunk Screws (4pc + Lubricant) - drill a pilot hole and follow with the appropriate sized countersink bit. This set includes all 4 available sizes in this series....10mm, 16mm, 20mm & 25mm (approx 3/8", 5/8", 3/4" and 1"). These Facom bits have 3 HSS cutting edges for clean countersunk holes. HSS (High speed steel) bits are more resistant to heat than carbon bits.

For use with wood or metal. See photos (click to enlarge) for sizes and dimensions of the 4 different bits. Also available individually if you only require 1 or 2 sizes.