... OEM service is available 4. Strict quality contral 5. Deliver in time 1.superior quality long life2.trust worthy3.precision level ... ISO90005.package:according to the customer's requirement6.superior quality,good performance 7.material:GCr15,GCr15SiMn 8.trust worthy ... bearing, etc.3 retainer: cooper, nylon, bakelite, stainless.4 quality:ISO90005 delivery: great stock and ready goods6 Bore diameter: 1mm ...