TracRac 25700 Locking TracKnob Pair
The Locking TracKnobs include a pair of replacement knobs which can be used on the Overhead Racks, Basetrack Tiedowns or Cargo Holder to discourage theft.  Also included are two matching keys to lock accessories securely to base rails. TracKnobs are made of rugged stainless steel with a nylon tipped stud.