Product technical specifications Bellelli Multifix is steel made anchoring system for rear-mounted child bicycle seat. It fits to circular section frames and to a wide range of modern and elliptical section frames Fast and simple to install Multifix is equipped with an easy-on/easy-off push-down button If you have two or more bicycles Bellelli Multifix will allow you to switch your child bicycle carrier from one bike to another in a matter of seconds Steel made anchoring system for rear-mounted child bicycle carriers Fits to circular section frames and to a wide range of modern and elliptical section frames