... Bit (1)Diameter:38mm-70mm.(2) shape, carbide 3-blade type , steel cross bit , carbide cross bit ,button bit andetc(3)Package: in ... , various tap hole drill rods and tap hole drill bits are available. (1)Diameter: 38mm-70mm.(2) Shape; carbide 3-blade type, steel ... cross bit, carbide cross bit, button bit and etc. (3)Package ...