A high security barrel lock and key system that offers progressive levels of security. Its unique product design permits a one-key system. This means the S-1000 key will open the S-1000 lock, plus all competitive standard design barrel locks. All internal components of the S-1000 Barrel Locks are stainless steel. The lock bodies are available in stainless steel or cadmium plated hardened steel. The S-1000 system design offers superior tamper deterrence.