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-476, (D) Diameter: 1-7/8, (D) shank: 3/8, overall length (L): 3-1/2, FO-476 forstner pattern bit 1-7/8 dia x 3/8 shank