Benefits of 2200 Series Gravity Roller Conveyors: Specifications. Loads up to 80 lbs/ft (119 kg/m). Conveyor widths: 6 ″ (152 mm), 12 ″ (305 mm), 18 ″ (457 mm) and 24 ″ (610 mm). Conveyor lengths: 2 ′ ...