M1 level lock standard weightM1 level lock standard weight (according to national standard requirements) Our company is a manufacturer specializing in the production of standard weights, direct supply, no intermediate links, and obvious price advantages. The standard weights provided by our company

Cast iron weights, 25 kilograms of cast iron weights, 20 kilograms of cast iron weights-how does the production defect come aboutThe management of casting sand for cast iron weights is very important. Cast iron weight castings are all made of sand. Many factories do not strictly manage the sand. Oft