Are your Allen screws magnetic or not? A standard refrigerator magnet is enough to find out. If your screws aren't magnetic (e.g., made of aluminum, titanium, or stainless steel), you'll need our special Hexlox for non-magnetic screws .

Then the question arises: How many screws are under your saddle? We recommend securing all existing screws for the best possible theft protection.

Next: What size do you need? Grab an Allen key. For example, if a 5 mm key fits, you need a 5 mm Hexlox . Please remember to order the appropriate Hexlox key as well—without it, you won't be able to use the system.

Finally, which color do you want? You can choose between black and silver —depending on your style.

One final, important note: It's not enough to just secure the saddle. The seat post should also be protected, because even if the saddle is secured, a thief can still remove the entire post and saddle.