All locks are not created equal. C.K.'s recommends Medeco High Security Locks for the most reliable security.To be considered truly high security, Medeco cylinders and locks are tested by independent testing laboratories. Medeco cylinders meet or exceed Underwriters Laboratory UL437 criteria, most common or standard cylinders available today do not meet these minimum guidelines. Tests performed on Medeco high security locks:10,000 cycle endurance testResistance to picking or key fitting testsAttack resistance tests: Forcing, drilling, sawing, prying, pulling, and plug driving, and corrosion resistance in a salt fog chamber.