The Tonyon Anti Theft Bike Lock Steel Wire Bicycle Security Cable Locks with Keys is a medium-sized, black steel cable lock designed specifically for bicycles. Featuring a key mechanism for easy locking and unlocking, this cable lock is heavy-duty and waterproof, making it a reliable choice for cyclists looking to secure their bikes. Made by the brand Tonyon in China, this model offers a strong and durable option for protecting your bike from theft.