The Thule Thru Axle Shimano E-Thru Adapter replaces the 12 mm Shimano E-Thru rear axle on your bike. This allows you to attach a Thule ezHitch so you can tow a Thule child carrier or multisport trailer. It works with the Thule Cheetah, Cadence, Chariot or Coaster trailers and is simple and easy to install. It is 12 mm in diameter and for use with 170 mm length Shimano E-Thru axles with a M12 x 1.5 mmthread pitch.