These bits are designed to do deep slot and holes for tenon, especially in doors, chairs, tables etc. Special carbide with a 1" long up-shear and chip breaker for fast cuts and chip clearance. For use in lock mortising machines and door machines. , #45542, Diameter (D) 5/8, Cutting Height (B) 1, Shank (d) 1/2, Overall Length (L) 6-5/8, B1 4-3/4, Flutes 2, 45542 Carbide Tipped Up-Shear Bit Slot Mortiser 5/8 Dia x 1 Inch x 1/2 Shank