6.4mmsteel ball for curtain 1.material:AISI1010-1015 2.size:6.35mm,4.76mm.5.55mm,4.5mm,7.938mm,9.525mm 3 ... .grade:G500/G100 Namehot sale 1/4",3/16",7/32" carbon steel ball for curtain made ... in ChinaSize6.35mm,4.76mm.5.55mm,7.938mm,9.525mmGradeG1000Quality standardISO9001:2008Featureshining surface ...