The Irwin Blue Groove 4X flat bit have 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.
The Irwin IRW10506629 8 piece Blue Groove 4X flat bit set includes the following pieces:
12, 16, 18, 20, 22, 25, 28 and 32mm diameter bits.