philip head machining screw 1/ micro machining 2/ high quality steel alloy ... head machining screwsMaterialStainless steel, Carbon Steel, copper, ironMachining method Screw machiningSurface finishChrome plating, zinc plating, blackening, Nickel plating, Electrophoresis ... ,000 pcs per monthDelivery time15-20 days after order confirmation.Packing Methods1.Prevent from damage.2.As per customers' ...