... steel,brass,copper,alloy steel,aluminum,cold rolled steel with various plating.3) Surface treatment:kinds of plating (Zinc, ... equipment for ensuring quality:projecting apparatus,height gauge,callipers,microcalliper,pin gauge,bevel protrator,thread gauge,etc.For the quickest results, when requesting ... .the equipments are complete that we can meet your various needs. In 2003,we become a membership of the ...