... stainless valve balls 2.Hardness:HRC58-62 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 ... wear-resisting, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings ...