173110-2RSBicycle bearingsSize:17mm X 31mm X 10mmDimensionsBore(d) 17 mmDiameter (D)31 mmWidth (B) 10 mmSeals Type Rubber sealQualityP6.Z2 / ABEC-3.Z2MaterialBearing steel (Gcr15)Quantity 1 PCSBearings are made of Chrome Steel, each bearing has 2 sealed with rubber seals to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.==========is_customized : YesMaterial : Bearing SteelModel Number : 173110-2RSOrigin : Certification : None 1pcs Bearing 173110 17x31x10 173110-2RS Shielding Ball Bearing Bicycle bearing axis Flower drum bearing Brand Name CLXDKLKEQ Manufacturer CLXDKLKEQ