Roller conveyors consist of rollers that are mounted on a series of axles attached to rigid fixed or telescoping frames. The rollers let loads roll along a path from one place to another, reducing the effort it takes to move the loads. They provide a stable surface for moving loads with rimmed or uneven bottoms, such as drums, pails, pallets, skids, and bags. Loads can roll forward and back along the conveyors, and they can also be pushed from side to side across the conveyors' full width. Roller conveyors typically have a higher weight capacity and are better suited for moving heavy loads than skate wheel conveyors. Gate kits, roller covers, and other roller conveyor components can be added to customize the conveyors for specific tasks. Roller bearings can be used to replace existing bearings so that the rollers continue to turn smoothly. Roller conveyors are often used in warehousing, package handling, manufacturing, and distribution applications.