Unlike some cheap bolts from China these are made in the EU, in an ISO9000 approved factory and have TUV approval. They are bright zinc plated to a high standard. This finish will not chip or crack off as with cheap bolts.
Each set of locking bolts are supplied with a matching removal key. The unique toothed design varies from one set to the next. This is a good security feature that you won't get on cheap locks.
Tip: Keep the key in a safe place. Also, make a note of the code that is stamped on the end of the key. If the key is ever lost you can quote this code to obtain a replacement.