die casting parts ending cover and piston made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG, ... piston made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG,SC,,SU,TN,STM, ... different kind aluminium .zinc ,plastic ,die casting parts and make different kind mold according to our customer ... kind mold according to customers request!!! ISO 6431 piston(die casting parts)