Suits HB-M525 (Deore - Disc), HB-M510 (Deore), HB-MC33 (STX-RC), HB-MC32 (STX), HB-MC30 (STX). Also can be used in place of discontinued Shimano Part Number Y21498020 which suited HB-1055/1056/6400 but will need the steel dust cover removed (see "More details").
M9 x 11.5mm. Steel dustcap included.
Shimano (discontinued) Part Number: Y21L98020. Weight: 10g.