DOUBLE-UNLOCK DESIGN: The locker padlocks can be unlocked with the key and combination code, which perfectly solve the problem of forgetting the password. One key can be used to open one lock or many locks. (The key helps to unlock but can not find the password back). .HIGH SECURITY: The gym padlocks owns 4 digit combination equipped with avoiding password change by mistake design, which can combine up to 10,000 unique passwords resulting a super reliable and safe purpose. It's 10 times harder to crack than a three digit lock. .DURABLE PADLOCK: The body of the padlock is made up of a zinc alloy and the surface is sprayed with baking paint to prevent corrosion and rust and comes to good feeling. The lock hook is made of hardened steel, which makes it much harder and stronger and more wear-resistant. for your peace of mind. .MULTIPLE USES: The school locker padlocks is portable and perfect for both indoor and outdoor use. Great for sport locker, cabinet, gym, school locker, employee locker, toolbox, garage, shed, hasp, gate, fence and container etc.