Twin Plain Linear Bearing Pillow Block - PWN12 3/4" OpenTwin sized plain linear bearing pillow block, open shell, 3 4" ID made of aluminum alloy with holes for mounting and featuring a precision cut Simplicity plain bearing with an anodized aluminum shell and the renowned self lubricating FrelonGOLD bearing liner for maintenance free operation, low friction, and durability in extreme conditions like high temperatures, dirt, and vibration. The twin design resembles two blocks positioned end to end Precision