Use this 12mm Thru Axles Adapter to replace the previous Thru Axles, and can easily the bike trailer hitch to the bike. Make of Metal materials and the shafts is solid. Thread is precise, not damage frame, and fits tightly. Equipped with 4 aluminum alloys gaskets of different thicknesses. Suitable for bicycles with different rear Axles widths. Please measure the length of the previous shafts and check thread Pitches before purchasing. Thread specifications:M12x1.5mm Colour:Black Material:Metal Package Contents: 1set * Thru Axles 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.