Hybrid Ceramic RM2-2RS 3/8 Si3N4 V-Groove Guide BearingRM2 2RS Ceramic Si3N4 V Groove Guide Bearing 3 8" Inner Diameter One Bearing RM2 2RS Ceramic Si3N4 V Groove Guide Bearing, bearing is a Sealed. Inner Diameter is 3 8" inch. Item: RM2 2RS Bearing Type: V Groove Guide Bearing Inner Diameter: 3 8" inch Balls: Si3N4 Quantity: One Bearing Dimensions (mm) d D A C A1 rs 9. 525 = 3 8" 30. 73 18. 24 11. 1 12. 7 0. 3