retaining rings for holes

Finish：Plain, black oxide , Zinc Electroplating,Hot Dip Galvanizing,Copper plating,Nickel plating,Zinc impregnation,ETC. Material：Carbon steel、Stainless steel Standard ：GB, DIN, ISO, ANSI/ASTM, BS, JIS,ETC. Non-standards：OEM is available, according to drawing or samples. Samples：Samples are free. Package：Wooden boxes, pallet, cartons, plastic bags, nylon bags.