... -M24 4.Length 8mm-45mm 5.Finish:zinc plate,brass plate, Metric ISO8750 Black zinc plated Slotted Spring Pins 1.Material carbon ... steel,stainless steel,copper and etc.. 2. pin style spring pin 3. Standard ... ISO8750, ISO8752, ASME B 18.8.2, DIN1481 4.Surface Finish zinc plate,plain finish ...