There’s a reason your keychain is a giant, jagged ball of steel: so far, every lock and every thing worth locking comes with its own unique key to add to the collection. The BOLT series solves this problem with an ingenious lock cylinder mechanism that “learns” your car key’s shape upon first time use, effectively reducing your keychain’s population by one. Locks are ordered depending on car model and year, although not every car model is compatible.

Head over to BoltLock’s site to find out more – 28$. [source]