A gravity roller conveyor is a type of material handling system used to move products from one place to another. It operates on the principle of gravity, where the product rolls down an inclined plane, and the rollers move it forward. The rollers are typically mounted on bearings and are used to support and guide the product as it moves along the conveyor. Unlike powered conveyors, gravity roller conveyors do not have a power source and rely on gravity to move the product. They are commonly used in various applications such as packaging, assembly, and shipping, and are often favored for their simplicity, reliability, and cost-effectiveness.