This anti-theft system safeguards both wheels and the seatpost of your bike. Matching locks and high-quality parts. The set includes front and rear wheel locking skewers for both front and rear wheel, a lock for the seatpost and seat collar, and a coded key. With the locks installed on your bike, you don't need to remove them when you want to ride the bike again. The locks are composed of corrosion-resistant CrMo steel and aircraft aluminium alloys.