Product Features: ・This is a B-type retainer compatible with Shimano & Avail. Weight: Approximately 0.25g Color: Red Compatible Models: ・Can be installed on many genuine Shimano handles. ※Excluding some models such as Antares and Calcutta Conquest, which do not have nuts or have hidden nuts. ・Can also be installed on Avail offset handles. ・We are not specialists, so we cannot answer individual compatibility inquiries. Thank you for your understanding.