1.material:AISI1010-1015 2.size:1/4",3/16",6mm.6 ... :2008 5.inspection & warranty Namecarbon steel ball for curtainSize1/4",3/16",6mm.6.33mm,6.5mmGradeG1000Quality ... , excellent surface, best quality and high hardnessApplicationMainly used for simply bearing, curtains, castor wheel, bicycle, aviation ... , T/T, D/P,Delivery10-15 days for one 20ft containerPort of shipmentQingdao/Tianjin/NingboAbout Taian ...