产品表面镀铬、锻打工艺、经热处理，其产品品质达到美国ANSI标准、德国DIN标准及国际标准ISO9002国际质量体系，ISO9001：2000质量体系认证.欢迎来信、来电咨询，我们将会为您提供最优质的产品和最真诚的服务！    Ring spanner, size ranges from 6*7 to 50*55 made of quality carbon steel (45# steel). The surface is chrome finish. The products are available for supply both in pieces and sets according to the customer's needs.