Precise thread without burrs, no damage to the frame, close fit to enhance stability, not easy to slip. Equipped with 4 aluminum alloy gaskets of different thicknesses, adjustable width, suitable for bicycles with different widths of rear axles, compatible with more. Aluminum alloy material, CNC processing, adjustable length, easy installation. Product name:Bicycle Trailer Thru Axle Adapter Size:Length 215mm, thread length 36mm (As Pictures Show) Model:P1.0 160-178MM Colour:Black Material:aluminium alloy Package Contents: 1 * Bicycle Trailer Thru Axle Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.