Adopt S7 tool steel and German IPSEN heat treatment Technology. Fit for BASSO, PASLODE, MAX, BOSTITCH, HITACHI,SENCO. The sole one manufacturer of piston driver adopting America SHOCK-RESISTANT TOOL STEELS OF S7. The sole manufacturer of piston driver with German Heat treatment Technology. The sole manufacturer of piston driver with advancing cooling technology. The concentricity of the product is up to 0.05-0.1mm. Life time: 2 million times