These cylindrical key keepers come with a high-security 7-pin tubular lock mounted in a solid vault-like door. HPC’s Fleet Security™ Key Vault is made of Delrin AF, a unique thermoplastic substance, resistant to weather and rust. They can be mounted flush under the hood or in the body wall. These versatile units also can be used in the home to keep valuables in a safe place. With HPC's Fleet Security™ Key Vault, the service set of keys are kept with each vehicle, but are only accessible to the service or security people.