Although our acetal (plastic) 0.250” servo sprockets are very strong, our patented Super-Duty 0.250” aluminum servo sprockets are even stronger. They mount directly on the servo spline and at this time only come in 10 tooth. If you are needing a higher tooth count, please look at the acetal servo sprockets. Our metal chain (sold separately) can handle up to 280 lbs of force and the length can be easily changed using our metal chain breaker. These sprockets also work with our plastic chain.