... black, engraving fonts 3,ROHS products Product name Aluminum cap/cover Materials Available1. Stainless Steel: SS201, SS303, SS304 ... gears (pinions, wheels ) bearing, bearing seat, spring, connector, socket, bushing, push-button, etc.Surface Finishannealing, natural anodization, heat ... processing and manufacturing various kinds of metal parts and screw, nut, rivet of national standard and non-national ...