Forstner pattern bits are well known for their ability to drill clean and chip-free holes in wood. Amana Tool uses only the finest quality tool steel, precision machined and ground on state-of-the-art equipment. Large gullets milled in the tool body provide exceptional chip clearance., #FO-508, (D) diameter: 2, (D) shank: 3/8, overall length (L): 3-1/2, FO-508 forstner pattern bit 2 DIA x 3/8 shank