Includes rack accessories such as alignment strips, lock kits, mounting rings, and shelving units specifically designed for use with racks and rack cabinets. Excludes lubricants, rust and corrosion inhibitors, potting compounds, cover strips for structural systems, silicone conformal coatings, seals and O-rings, flanged bearing units, air curtain doors, PVC and ABS cement pipe fittings, and shaft collars.