This unit carries a chain over a mounted sprocket wheel running on an integrated bearing, with a bore diameter of 16.2 mm and an outside diameter of 40.0 mm. The sprocket is made from steel or sintered iron, and the complete unit weighs 0.33 kg. The compact design integrates the rolling elements directly with the sprocket body, keeping the mounting envelope small for the given bore size. The fixed bore diameter and outside diameter make this unit suitable for direct installation on a shaft or axle where a chain needs guiding or tensioning without a separate housing. The sintered iron or steel sprocket construction provides the wear surface for chain contact, while the low net mass keeps rotating inertia down. As no interchange references are provided, mounting dimensions should be verified against the bore and outside diameter values given here before installation.