Allen Sports 532QR is a bike rack designed to be installed on Class III/IV 2" or Class IV 1 1/4" hitches professionally installed on automobiles. It allows you to transport up to 4 bikes, with the heaviest bikes loaded first for best weight distribution, and padding added between contact points if needed. The rack is easy to install and remove, with a hitch insert that can be adjusted for the correct hitch size, and a locking knob to secure the rack in place. Bikes are secured to the rack using individual tie-down straps, or additional straps if necessary.