The Irwin IRW10502826 Blue Groove 4X flat bit 6 piece set includes the following pieces: - 10mm - 13mm - 16mm - 19mm - 22mm - 25mm - The Irwin 4X Blue Groove Flat Bits have a patented groove point, and cutting edge designed to cut and not scrape the timber 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.
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