"Make riding with two a family affair with the Orion mounting block kit! with the Orion mounting block kit, you can freely switch your Orion child bike seat from one bike to another in a matter of seconds. The innovative bracket system allows the mounting block to be fixed to the head tube of the bicycle. This enables the Orion to be attached to the bike in a way that will not throw of the center of balance for the rider. By installing the mounting block kit, the "one-click" installation system is now at the hands of multiple riders. Also, the one-time installation and unobtrusiveness of the mounting block allow rider to install and forget about the block until it's time to add their little passenger."