... AgSnO2/Cu AgZnO/Cu Ag/Cu Quality Control:1. no oil,indentation, pit circle printed, needle stain, tearing, deformation,scratches ... or visible.2. No stratification, burr, sripe,pit etc in the side of rivet head3. no liable to oxidization on ... resistanceApplication Field:Our Rivets series electrical contacts is widely used in small and medium-sized current contactor,starter,temperature controller, ...