ā—¸Replaceable carbide knives to extend tool cutting life. Just replace the knives when dull or turn to sharper edge if applicable. Replaceable knives are as much as 4 times longer lasting than carbide tipped equivalent.. ā—¸SPECIFICATIONS: (D) Diameter: 2 (B) Cutting Height: 53/64 (d) Shank: 1/2 Overall Length (L): 2-19/32 B1: 1/4 Max RPM: 18,000 Flutes: 3 D1: 5/64 D2: 2-1/2