Changing Combination On A Sargent & Greenleaf 8500 Manipulation Proof Safe Lock

Designed for the most demanding, high-security applications and based on S&G’s original MP Manipulation Proof® locks, 8500 series Group 1 and 1R mechanical combination locks provide superior durability and long-lasting performance. With three combination wheels, our Group 1 combination locks offer over 1 million possible combinations to deter combination hacking attempt.