each pin spins to lock or free a corner of the MAXTRAX. each is lockable and able to accommodate either two or four MAXTRAX. here's what MAXTRAX has to say about them:
Genuine MAXTRAX Mounting Pins are the easiest, safest, and most secure mounting solution for putting your MAXTRAX on a roof rack or cross-bars. Constructed from high-quality black nylon and stainless steel, these quick-release pins can hold one or two sets of MAXTRAX (2 or 4 boards).
Top roof rack manufacturers, including Rhino Rack, Eezi-Awn, Front Runner, and more, make a reciprocal bracket that allows for a bolt-on roof rack mounting solution.
Designed exclusively for MAXTRAX MKII—these cannot be used with any other brands.
The design also permits a TSA-style padlock to be run through the top of the pin to keep your MAXTRAX secure—we recommend a bicycle cable lock if your security requirements exceed this.
High-quality black nylon and stainless steel quick-release pins for securely mounting your MAXTRAX on a roof rack or cross bars.
Only one set is required for mounting one or two sets of MAXTRAX (two or four boards total).