1616-2RS Sealed Ball Bearings 1/2" x 1 1/8" x 3/8" inch Lot of 10 Bearings 1616-2RS Sealed Ball Bearings, the inner diameter is 1/2", outer diameter is 1 1/8" and the width is 3/8", this is a popular size that could be used in many applications, Bearings are made of Chrome Steel , each bearing has built-in rubber seals to protect the bearing from dust or any possible contamination. Bearings are packed 10 bearings in one plastic tube.