Part No.3076T4512 Bit Diameter: 76mm Button Bits: 12 Buttons Button bit design: Flat face, drop center, normal and retrac body. Tungsten carbide (Buttons): Spherical, ballistic and conical. Applications: Bench, production Website:www.maxdrillrocktools.com We have different designs for various rock formations, and a longer service life to decrease use costs for users.