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The striking box wrench ( ring spanner )aremade of c45 steel and accroding to DIN standard We have both metric and inch size : 17 210mm , 5/8" 5" We aremanufacturerwhich is specialized inproducingnon sparking tools,special steel tools and non magnetic tools .We manufacture products with ISO9001:2000 certificate and Our products had been used widely in domestic and exported to forty-one countries, such as U.S.A, Germany, England, Italy,France,Spain,Australia,Holland,Japan and many other countries.