... and piston made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG,SC,SU,TN,STM,CK ... and piston made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG,SC,,SU,TN,STM,CK diameter ... form 32mm~320mm.Gas-assist injection mold design and mold making.!High gloss ... desigh different kind mold according to customers request!!! ISO 6431 piston(die casting parts)