Light-duty roller conveyors with steel frames are stronger and provide better resistance to abrasion and impact than light-duty roller conveyors with aluminum frames. They are suitable for tasks where the weight and volume of the items being moved on the conveyor are low. Also called conveyor sticks, rigid-frame roller conveyor sections consist of rollers that are mounted on axles attached to rigid frames. The sections may be straight or curved. Each section has hooks that connect to pins on other sections to join them and create a conveyor line that allows items to roll along a path from one place to another. Each section must be supported by compatible conveyor stands. The number and spacing of the stands used to support the conveyor section will affect its capacity.Roller conveyors consist of rollers that are mounted on a series of axles attached to rigid or telescoping frames. These unpowered (gravity-flow) conveyors use a downward slope or a manual push to move loads down the line. The rollers provide a stable surface for moving loads with rimmed or uneven bottoms, such as drums, pails, pallets, skids, and bags. They allow the loads to roll along a path from one place to another, reducing the effort it takes to move the loads in package handling, warehousing, dock, assembly, or inspection tasks. Loads roll forward and back along the conveyors and can be pushed from side to side across the full width of the conveyors. Roller conveyors typically offer more weight capacity than skate wheel conveyors. The conveyor's roller spacing density affects the size of the items that can be conveyed on it. The smallest item on the conveyor should be supported by at least three rollers at all times.