Regarded as the industry standard for Group 2 mechanical safe locks, the Sargent and Greenleaf Model 6730 mechanical safe lock makes it easy to upgrade your home gun safe. Designed to provide enhanced attack resistance and durable performance, Model 6730 delivers proven mechanical security……. – COMBINATION CHANGEABLE: With three key-changeable metal wheels, Model 6730 supports up to 1,000,000 theoretical combinations and allows simple combination changes at the lock…. – ATTACK RESISTANT. Model 6730 is built with a patented torque adjuster and integrated relock trigger to resist punch attacks, auto-dial attacks, and a wide range of other threats…. – PROVEN SECURITY. Model 6730 carries multiple internationally-recognized certifications, including UL Group 2, Vds1, A2P A/E, and EN1300 Class A…. – ALL METAL DURABILITY. Constructed of solid brass dual lever locking arms and a machined brass wheel center, Model 6730 provides the ultimate non-slip wheel and delivers long-lasting performance…. – ALL-INCLUSIVE KIT. Get everything you need in one complete kit: Group 2 combination lock, D300 dial and dial ring in black and white finish, and mounting hardware. Aluminum wheel cases Key-changeable wheel design Internal relock trigger Compatible with Sargent and Greenleaf Group 2 and 2M dials and rings Model 6730-100 Mechanical Safe Lock Kit