Size(diameter):M6 M8 M10 M12 Material:carbon steel(grade 4.8) Color:Yellow/Silver Coating:zinc plated Origin: Yongnian, Hebei, China Minimumordel: Not limited to. Our strengths: one-stop service, high quality, competitive prices, on-time delivery, technical support, supply of materials and test reports. Notice: PLEASE ADVISE SIZE, QUANTITY, MATERIAL OR GRADE, SURFACE, if customized please provide drawing or size.