Fractional Diameter 9/16 Decimal Diameter 0.5625 Bolt Diameter 1/4 Neck Diameter 17/64 Number of Teeth 6 Overall Length 2 19/32 Shank Diameter 1/2 Tool Width 15/64 Undercut Length 35/64 Weight 0.15 lbs 272108Type 2721Stock: In Stock.$183.50 Category: 2721-F