... 0.3-1.0/1000 UsageApplicable to hydraulic pressure, pneumatic cylinder,oil pump barrel, motor body, transmission shaft, etc.Quality ... treatment(BKS)- Honed or SRB- packingSteel GradeST52/E355, ck20, ck45, 34CrMo4, SAE 1026, SAE4130,SAE4135, SAE4140, 27SiMnSize Processing Cylinder diameterLength /mmStraightnessSize ... Size InspectionSKYPE: samsonhuang22 honed tubes for hydraulic and pneumatic cylinder