The Chain Keeper Extension can be used can be used in addition to original clamping Chain Keeper to work with frames that have tapered seat tubes. By extending the reach of the Chain Keeper, the Chain Keeper Extension allows the clamp to attach to a higher section of the seat tube tubing with a straight circular profile. The Extension can also be used on some rear-suspension frames to reposition the clamp behind the seat tube. Please note that Chain Keeper Extension may not work with all frames. Specification: Material: 6061 Aluminum Weight: 37.1g Black only.