The Saris Bones Knob is the OEM replacement knob for the Saris Bones 2 and the Bones 3 bike racks.
Works perfectly. This is my second purchase. Priced fairly and the option to purchase individual pieces is a plus. 2nd round bought enough after a group consolidation to save on shipping!
During a move, three of our Saris Bones Two Knobs got lost. The ones we received from ACK were perfect quality and did the trick. Other places I looked, including the Saris website, came six in a pack and were more expensive. The ability to buy only what is needed, the inexpensive price, the fair shipping cost and the Saris quality made this a great purchase!