... piston ending cover and piston made by aluminium-alloy for pneumatic cylinder ,Iair cylinder pistonSO 6431,DNC,MB air ... Ending cover and piston made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG,SC,, ... SU,TN,STM,CK diameter form 32mm~320mm2:Surface treatment: ... customers request!! die casting parts SC piston for air cylinder(air cylinder piston)