A planetary gearbox sprocket is a wheel with the teeth, cogs, or even sprockets that mesh with the holes in the links of chain, monitor, or other perforated material. A sprocket differs from a gear just because a sprocket never meshes straight with another sprocket. Sprockets are made to be used with a specific chain. Selecting the most appropriate sprocket optimizes sprocket/chain interaction, ensures drive efficiency, and decreases maintenance.