The process refers to the removal of 1 kg of steel using drilling machining technology. If the weight of metal removed by the drilling process is not specified, the average assumption of "generating 0.0680 kg of steel waste per 1 kg of final product" can be used. The data comes from the production processes of gears, flow meters, cable accessories, couplings, drill bits, butterfly valves, crystallizers, and other mechanical and electrical equipment accessories.