●UNIVERSAL DESIGN---Can work with traditional bikes as well as disc brake and full suspension models.Fits QR axles and solid axles up to 12.2mm (OD≈0.5in). ●WELL MADE AND STRONG---Made of high quality steel.Solid construction and well built. Coated with powder paint which made it blends into your bike perfectly even when no trailer is connected. ●EASY TO INSTALL--- Just to make sure it doesn’t spin while tightening, and throw an Allen wrench through the pin hole and hold in position while tightening. ●WARRANTY---18 MONTHS Limited Warranty.Note:can not fit with Breezer style dropouts. ●Now!Enjoy the joy and excitement of transporting your kids or pets around with your bikes.