SFR168ZZ Shielded Ball Bearing 1/4" x 3/8" x 1/8" inch One Bearing SFR168ZZ Shielded Stainless Steel With Flanged Ball Bearing, this is a popular size that could be used in many applications that uses this size 1/4" x 3/8" x1/8" inch. Bearing is made of Stainless Steel.