... so that our button bit can withstand the toughest rock drilling demands,and transmit intensive impact energy into the rock with ... the least possible loss of energy.According to different drilling application, we have different design to meet customers with good ... : alloy steel MOQ: 10 pcs Body Type: Thread button bit; Tapered button bit Thread type: R25,R28,R32,R38,T38,T45,T51 ...