The ProRac Ball Mount Bike Carrier is designed to quickly clamp onto a 2'x2' ball mount leaving the tow ball totally accessible for towing. Saddles Securely holds and protects bike frames. Hitch-mount bike carriers are handy, but they take up your whole hitch receiver. With the ProRac Ball Mount Bike Carrier, however, you don't have to leave the trailer in your driveway. This bike carrier hauls 3 bikes behind your vehicle while leaving your hitch receiver free. Order today to get huge discount and free shipping.