... 62 3.Grade:G100 4.1/2",3/4" 1,1/4' 1,1/2' 1/2",3/4" 1,1/4' 1,1/2' Thread Ball Valves Stainless Steel 304 1.steel ball specification: 1)material:AISI 1006, ... resisting, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, ... low noise special bearing 4. Ball valves for liquid and gas ect 4.Enjoy more of the steel ball product images: ...