6004-2RS Sealed Ball Bearing 20mm x 42mm x 12mm Lot of 10 Bearings 6004-2RS Sealed Ball Bearing, 10 Ball Bearings 6004-2RS for use with ATV Wheel Bearing, Bearing is made of Chrome Steel, each bearing has 2 Blue Rubber Seals to protect the bearing from dust or any possible contamination, the inner diameter is 20mm, outer diameter is 42mm and the width is 12mm, also bearings are pre-lubricated with grease.