SR6-2RS ABEC-5 Ball Bearing Stainless Steel and Ceramic Balls 3/8" x 7/8" x 9/32" inch SR6-2RS Stainless Steel ABEC-5 with Ceramic Balls bearing, this is a popular size that could be used in many application that uses this size 3/8" x 7/8" x 9/32", each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.