... Machined and turned SGS audited More than 20 years experience 1,Name: Adjustable screw for sewing machine;adjustable screw;screw for sewing machine 2,For the ... ,etcAlumimum100,5052,6061,6063,etc(2),Ability for the surface finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold plated ...