Function of shank adapter is to transmit impact energy from the rock-drill piston, as well as rotation torque, into the drill string without energy losses, and then must withstand the most extreme stress. It transmits blows from the piston continually.DELSON Rock Drilling Tools offers premium quality sleeve couplings and shank adapters for all common thread types and combinations. We supply shank adapters (striking bars) with great endurance and dependability for all drilling machine (including Atlas Copco, Tamrock, Furukawa, Montabert, Sandvik)