... Bearing BK0408 1. Specification:4*8*8mm 2, material:Chromal steel,stainess steel 3, precission:P5 class Needle Roller Bearing BK0408 Packing&DeliverPacking ... +,BK,HK+,NA48+,NA49+,NA69+,seriesRetainer:copper cage,nylon retainer,steel retainer,bakelite retainer,etcFeature:low noise,high speed,long lifeOur ...