Specification</br> Material: Steel</br> Color: Black</br> Size: </br> junction part to bike</br> hole dimeter: 0.4 inch/ 10mm; </br> diameter of screw nut fixed in: 0.87 inch/ 22mm;</br> the embedded part attached to trailer</br> hole diameter: 0.27 inch/ 7mm; </br> length: 0.76 inch/ 19.5mm;</br> insert part diameter- 0.58 inch/ 14.8mm.</br> Quantity: 2 packs</br> Package includes:</br> 2 x Bike Trailer Couplers</br> 2 x Connect Pins</br>