Features For all applications in wood and wooden materials. Fast and precise cutting thanks to specially hardened pre-cutters. Extremely accurate centering without tear-out at the edge of holes. 1/4" hexagonal shaft prevents the drill bit from slipping into the drill chuck. Specification Suitable for use with: Beams Chipboard Hardwood Laminated Chipboard Plywood Softwood Veneered Wood Size - 38mm x 152mm