... consisting of chain plate ,supporting board and pinshaft,etc.Characteristics:1.The chain plate is chromiunm plated.So it has nice ... life of the drag chain shall not be less than 1 million times (reciprocating). Good quality raw material ,Precision machining, Strict inspectiWe ... or stainless steel or copper or nylon and so onFeathure:1.Material: Alloy Steel, Carbon Steel, S tainless Steel, Harden & ...