... : ABEC-1, ABEC-3, ABEC-5, ABEC-7Seals Type: Open,Teflon Sealed,Rubber SealsNumber of Row: Single RowPlace of Origin: China (Mainland ... )Shield: Open,Teflon Sealed,Rubber Seals,2 Metal...Tolerance codes: ABEC-1, ABEC-3, ABEC ... information please contact us. SSR20 High Quality linear bearing Box-type SBR20 linear motion bearings SBR16