precision piston/plunger piston/piston ring 1.precision dimension 2 high quality 3 nice finish 4 good deliver precision piston/plunger piston/piston ring1.Material: carbon steel, stainless steel, brass, Aluminium,etc. 2.Craft:Cutting, CNC, Grinding,blacken.3.Finish:Blacken, Anodizing,Zinc, Nickel, carburizing, heat treatment, polish, etc.4.various size can be available.the parts can be ...