Name: insert bushing, spacers, washer, roller. button Material: 303 stainless steel, 6061 & 7075 aluminum, steel, brass Finish Name: insert bushing, spacers, washer, roller. buttonMaterial ... : 303 stainless steel, 6061 & 7075 aluminum, steel, brass Finish: plain, zinc plated. polishMaterial: brass / aluminum / stainless steel. Surface treatment: nickel plating, silver ...