M9 P1.25 304 Stainless Steel Anti-Theft Locking Nuts Security Hardware Kit for Mountain Bike Awning Car Accessories for Styling Light Bar Safety,(4 Lock+ 1 Key)

works exactly as designed for my roof rack atachments.

These security nuts fit my need perfectly. I attached aluminum roof rack cross bars to the top rails of my utility trailer via M8 T-slot bolts. I felt like I needed to remove these every time I would take my kayak to the lake as I could remove both bars within a couple of minutes using a 1/2” wrench. Now I don’t have a concern with them walking away so quickly. I don’t believe that anything is theft proof, if someone wants something they will find a way. This is only a deterrent as it will provide a little more difficulty to remove without the key. As a test I have tried gripping these with different sized sockets and pliers and was unable to get them to turn.

These are excellent quality but I ended up going with a different style that felt more tamper proof.

I bought these to secure my roof top tent to my bed rack on my Tacoma pick up truck. The hardware itself worked as it should. The key fit into each nut and the nuts threads went on without issues. My only gripe is the quality of the nut. It doesn't have that "weighty" feel to them, so I'm afraid to torque them down too much to the point that the threads will strip. All in all, a great product. Used more so as a preventative measure against theft. With enough determination, someone could get these off.

Es una tuerca versátil para asegurar piezas de su automóvil que son robadas frecuentemente.

I have expensive off road lights on my truck. I installed this as a deterrent. Very easy to install. Let us be real. If someone wants something they will get it but this makes it a little harder. I wanted a little more torque on the nut but it appears to be tight enough.