... 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: ... AISI 1006, AISI 1008, AISI 1010, AISI 10152)Size:0 ...