The Medeco Maxum deadbolt prevents a burglar from making a sledge hammer useful on the lock of your door. Supreme mechanical cylinder features and certifications make this solid brass construction the best. Medeco Maxum deadbolt is in accordance with the UL437 standard for the safest locks on the market. It’s free turning collar and 1/4 inch diameter mounting balls resist nearly everything. The Medeco Maxum deadbolt is the lock to ensure all your security needs.