Plain Linear Pillow Block Bearing P16 1" ClosedClosed Plain Linear Bearing Pillow Block with a 1" inner diameter and a precision running clearance of 0. 0005 inches 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. Optional liners: corrosive chemical resistant FrelonJ & FDA compliant FrelonW