... Producing standard:GB308-20026)Feature: wear-resisting, excellent surface quality and high ... High - speed, low noise special bearing 4. Ball valves for liquid and gas ect 7/32" Series steel ball retainer with chrome steel ball ... Type:Manufacturer, Trading Company, Distributor/Wholesaler Product/Service(We Sell):Steel Ball,Ball Retainer,Stainless Steel Ball,Coloured Steel Ball,Carbon Steel Ball,Ball ...