screw ,bolt and nut 1.100% quality control , 2. Best Price with good sales service. 3. Fastest delivery time 1) Material: different kinds of stainless steel, iron, copper or aluminum etc2) Main equipment: CNC lathe, automatic lathe, hand lathe grinder, thread rollingmachine, tapping drilling machine etc3)Advanced measuring & testing equipment: projecting apparatus, roughness tester,hardness ...