R32 76mm Flat Face Standard Body Dome Button Bit for Rock Drilling The R32 76mm Flat Face Standard Body Dome Button Bit is a top hammer threaded button bit designed for efficient and stable drilling in rock formations. With a 76mm drilling diameter and R32 threaded connection , this 3-inch rock drill bit is suitable for compatible R32 drilling systems. The flat face configuration provides a relatively broad contact area at the hole bottom, while the dome-shaped tungsten