Plain Linear Bearing- EconoGlide IBM40-01 40mm ClosedEconoGlide closed shell plain linear bearing with a 40mm ID, designed as a low cost alternative to popular polymer lined linear bearings for cleaner applications and easy access machinery. Encased in an anodized aluminum shell, this standard sized bearing uses a self lubricating, injection molded Frelon IM liner made from grease impregnated polymer material for smooth, quiet, maintenance free motion. The closed shell fully surrounds a round shaft for