... steel ball 1.material:AISI1010-1015 2.size:6.35mm,4.76mm.5.55mm,7.938mm,9.525mm 3. ... grade:G500/G1000 Name1/4",3/16" AISI1010 carbon steel ball for curtain ... Size6.35mm,4.76mm.5.55mm,7.938mm,9.525mmGradeG1000Quality standardISO9001:2008Featureshining ... .your quotation and cooperation are welcome! 1/4",3/16"AISI1010 carbon steel ball for curtain