The Irwin Blue Groove 4X flat bit has a patented groove point and cutting edge. The cutting edges cut the timber 4 times faster, without scraping. The parabolic scoop optimises control and removal of wood chips.

These flat bits have an increased relief angle from 12? to 17?. The large shank is 152mm in length and 10% larger in diameter for added durability.

Diameter: 18mm