JJC Tripod Collar Mount Ring for the Canon EF 100MM f/2.8 Macro USM, EF 180MM F/3.5L Macro USM, MP-E 65mm F/2.8 1-5x Macro Photo Lenses, replaces Canon Tipod Mount Ring B (B) One (1) Tripod Mount Ring Compatible with: EF 100mm f/2.8 Macro USM EF 180mm f/3.5L Macro USM MP-E 65mm f/2.8 1-5x Macro Photo