The Park Tool CTP-4K Replacement Chain Tool Pin Kit includes four (4) replacement chain tool pins and one 5/32" ball bearing. To replace the chain tool pin, unscrew the cap, and pull out the old pin. Use care not to lose the ball bearing beneath the pin. Install the new pin and replace the cap. Park ToolCTP-4KReplacement Chain Tool Pin KitFeatures Designed specifically for the home mechanic that wants the best, the AK-38 Advanced Mechanic tool kit is a special 38-piece collection of the finest shop-quality tools, all packaged in a tough tool box The AK-38 includes all the most frequently used tools as well as some items a mechanic should not be without Everything needed to perform most repair and maintenance tasks, from brake adjustments to headset overhauls on the majority of current model bikes All tools covered by Park Tool's legendary limited lifetime warranty