The 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.1 x IRWIN® Blue Groove 4X Flat Bit 38 x 152mmAdditional Information:• Diameter (mm): 38• Overall Length (mm): 152• Pack Qty.: 1