61903-2RS Sealed Ball Bearing 17 x 30 x 7 mm 61903-2RS Sealed Ball Bearing, inner diameter is 17mm, outer diameter is 30mm and the width is 7mm,61903-2RS is a popular size that could be used in many applications, Bearing is made of Chrome Steel,bearing has 2 built-in rubber seals to protect the bearing from dust or any possible contamination,61903-2RS bearing is pre-lubricated with grease.