1.Deep groove ball bearing 6304-2rs 2.with low noise and wide application 3.wide application 4.Quality standard: ISO9001:2008 1.Material:GCr15,9Cr18,Chrome steel2.Quality standard: ISO9001:20083.Precision standard: ABEC-14.Shield type:Open, Z, ZZ, RS, 2RS5.Feature:Low noise,good quality6.Application:micro-motor, household appliance, automobile, telecommunication facilities, medical apparatus, ...