Dongguan King-Tower Hardware Co., Ltd is one of the largest enterprises to produce tight firmware in Mainland China. Our company produces all kinds of Sem screws,Safety screws,Chiacgo screws,Special screws,Customized screws,Plastic head screws Lathe screws,and Professional screw, to meet various standard requests from different countries. All the equipment is introduced from the United States, Japan and Taiwan. Good equipment, consummate craft and strict management enable the quality of the ...