Plain Linear Bearing Pillow Block P20 1.25" ClosedPlain Linear Bearing Pillow Block, closed shell, with a 1. 25" inner diameter and a precision running clearance of 0. 0005" per side. A mountable standard sized aluminum housing encloses the bearing, which features the renowned self lubricating liner made from FrelonGOLD for maintenance free performance under harsh conditions such as extreme temperatures, dirt and vibration. Liner options: corrosive resistant FrelonJ & FDA compliant FrelonW Anodized