The IRWIN® Long Series Blue Groove 4X 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 400mm in length and 10% larger in diameter for added durability.Select Option 10mm x 400mm12mm x 400mm13mm x 400mm14mm x 400mm16mm x 400mm18mm x 400mm19mm x 400mm20mm x 400mm22mm x 400mm25mm x 400mm28 x 400mm30mm x 400mm32mm x 400mm6mm x 400mm8mm x 400mm Add to Basket Quantity