1, Long life span. 2, Smooth surface. 3, Customized making available. 1, Process: Die casting & Fabrication & Machining work. First step: die cast out the covers at two head of the cylinder, meanwhile fabbricate the body shell. Second step: do some machining work and surface treatment, then assemble two separate parts together.2, Our die casting shop and equipments:3, Our machining shop and ...