Single twist wire rope, refers to the steel wire twisting production of a spiral wire rope, such as a variety of bicycle brake line. Double lay wire rope, refer···

Hardware: five metals. In ancient times, it refers to five metals such as gold, silver, copper, iron and tin, which were artificially processed into metal objec···

Hardware: five metals. In ancient times, it refers to five metals such as gold, silver, copper, iron and tin, which were artificially processed into metal objec···