1.Material:stainless steel 2.Shape:star lock washer 3.Tolerance:+/-0.05mm 4.We make standard and ... /Studs, Nuts, Tapping screws, Wooden screws, Washers/Gaskets, Check rings, Pins, Rivets and etc.2. by head typesFlat, Oval, Binding, Pan ... are suitable for your productswww.jielimetal.com.cn Type of Lock Washer JL-SCR-021