Chain conveyors are generally used to convey heavy pallets and racks. The load requires a bottom surface that can be carried directly on the chain strands. A wear bar is used to support the chain and the chain strands are driven by a center drive. Capacities range from small light weight loads up to large racks weighing several thousand pounds. A wide variety of chain widths and lengths are available. Many accessories are also available such as side guides, end stops, pin stops, lift-off zones, and set down guides.