NEVER Be Locked Out Again! Pick a combination that is easy for you to remember. You can be assured that your number is secure with over 10,000 combinations possible. In addition to the Hitch Safe being constructed of solid metal, it will have an additonal layer of security wrapped around it with the solid steel structure of the Receiver Hitch. Secure- 10,000 possible combinations, Durable- All metal construction, Zero Locking- Open the HitchSafe in the dark, Rust Resistant