The magnet fits in to the hex bolts on your skewer, seat post, stem etc. and can only be released with its corresponding "Key"
How the Keys function:
1. Each retailer is sent a limited number of keys and bolts in each order
2. These keys and bolts have the same 3 digit "code".
3. Each insert and key need to have the same 3 digit code to work.
4. This means that there is a super limited chance anyone will have the same key as you.
It's intentionally confusing haha. Just pick a letter and we will send you the right stuff