10 Bearing R1038-2RS 3/8 x 5/8 x 5/32 Sealed Inch Deep-groove geometry for high speeds and supporting both radial and axial loads Chrome steel for durability and resistance to deformity under heavy loads Normal radial internal clearance for applications that do not involve thermal expansion or atypical precision Rubber seals on both sides of the bearing keep the lubricant in and contaminants out