... experience 1,Name: Adjustable screw for sewing machine;adjustable screw;screw for sewing machine 2,For the similar screw,what can ... (2),Ability for the surface finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs ... Dip plating black oxide coating,hot dip galvanizing,etc Flame plating Light oil,spray coating,electrophoretic coating,etc Polishing ...