<br>Sturdy material: <br>Bike trailer coupler attachment is made of quality steel, sturdy and durable, well made and strong, coated with powder paint which made it blends into your bike perfectly even when no trailer is connected. <br> <br>Work for: <br>This bike hitch coupler can suit for many kinds of bike such as mountain bike, folding bike, road bike, etc. <br> <br>Have fun with family: <br>Enjoy the joy and excitement of transporting your kids or pets around with your bikes, just to make sure it doesn't spin while tightening and throw a wrench through the pin hole and hold in position while tightening. <br> <br>Specifications: <br>Size: 7.45 x 7.45 x 3 cm (connected bicycle part inner hole diameter 12.2mm) <br>Weight: 126g <br>Material: steel <br>Color: black <br> <br>Package includes: <br>1 x Bike hitch coupler with release rod