ABS engineering materials provide durability and precise keyhole workmanship. The lock frame is strength and resistant to distortion under pressure. Lock cylinder is made from antirust zinc alloy. The steel cable is wrapped with waterproof PVC, enhancing durability in tough environments. Easy and convenient: removable mounting bracket lets you attach the heavyduty lock to the bike frame or seat post for maximum portability. 4digit combination coiling bike lock: Selfcoiling design allows easy storage when not in use. Use scenario: While urban commuting, securely lock your bike to a public rack during short stops at shops or cafes; the frame/seatpost mounting option keeps the lock accessible and portable. Use scenario: On campus or in apartment complexes, attach the lock via the removable bracket for quick securing to bike racks between classes or errands. Use scenario: While traveling or commuting, take advantage of the compact selfcoiling design to store the lock in a bag or backpack, then mount it on the frame when needed.