... parts ending cover and piston made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG,SC,SU,TN,STM,CK die casting ... partsending cover and piston made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG,SC,,SU,TN,STM,CK diameter form ... drawing or desigh different kind mold according to customers request!!! ISO 6431 piston(die casting parts)