Two, three, and four-bolt flange and two-bolt pillow-block-mounted bearings now come with thermoplastic housings.Bearing inserts for the line include UHMW with maintenance-free lube strip, cast-nylon, stainless-steel ball bearings, chrome-steel inserts, and other plastics for special applications. The bearings are interchangeable with traditional cast-iron housings, furnished with stainless steel sleeves for shaft protection and positive locking, and standard end caps for contamination protection. The corrosion and moisture-resistant bearings survive wash-down environments, are self-lubricating, and maintenance-free.Slideways Inc., 705 Plantation St., Worcester, MA 01605, (800) 298-7543, http://www.slideways.com/Metal-Mounts-and-Plastic-Bearing-Inserts.html