An often asked question is "will there be key stock provided with that bushing?" The answer is actually pretty simple; only if the bushing uses a shallow key. This means that for any drive that uses standard key stock, you will need to purchase the key stock separately. If your bushing uses a shallow key, the key stock will be provided with the bushing. The charts below can be found on page 80 of our Poly Chain GT Carbon Drive Design Manual. These charts will show you which shafts will use standard keys, and which will use shallow keys.