IRWIN® Blue Groove 4X Flat Bit Set, 6 PieceThe IRWIN Blue Groove 4X Flat Bits have a patented groove point and cutting edge, designed to cut and not scrape the timber. They are 4 times faster than standard flat bits. The parabolic scoop optimises control and removal of wood chips. Increased relief angle from 12 to 17. The shank is 152mm in length and 10% larger in diameter for added durability. This IRWIN Blue Groove 4X Wood Flat Bit Set is supplied in a wallet. Contains the following: Sizes