The Wheels Manufacturing 386 EVO Adaptor for Shimano Hollowtech II Cranks adapts Shimano cranks to 386EVO-standard frames. Simply tap the adapters into the 6806 bearing in the BB shell or cups, then install the cranks using the included spacers to adjust chainline, or to take up any side-to-side movement in the crank. – Machined engineering-grade Delrin – 48g/pr Includes – (2) – 24mm ID adapters – (8 )- .7mm spacers