SR12-2RS Shielded Ball Bearing 3/4" x 1 5/8" x 7/16" inch One Bearing SR12-2RS Shielded Stainless Steel Ball Bearing, this is a popular size that could be used in many application that uses this size 3/4" x 1 5/8" x 7/16" inch. Bearing is made of Stainless Steel, each bearing is rubber sealed from both sides to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.