TracRac Black G2 Sliding Base Rails by Thule. 1 Pair. Lock your racks to the sliding rail to prevent theft or unauthorized reconfiguration with these locking knobs. When locked, the knob simply spins freely without loosening. Includes 2 knobs and 2 keys.

Stainless steel threads
Plastic knob
Supplied with 2 keys
Spins freely when locked
Prevents theft of racks
Smooth sliding and adjustability due to custom fit base rail.
Quick installation, without drilling into the truck.
Requires: Thule TracRac SR Overhead Rack or Thule Xsporter Pro Shift Overhead
Rack (sold separately).
Size: 196.9 length x 10.2 width x 4.8 height (cm)