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Collier Lock & Security, Inc. is authorized dealer of the Medeco high security lock system. Medeco locks are virtually pick proof and copy restricted. Many standard home locks and knobsets can be converted to work with a Medeco lock & key. When burglars see the Medeco name on a lock, they move on to the next! For a free consultation and quote on a Medeco high security upgrade, call 773.743.5397. Visit our website at http://www.thehome­securityspecialist­s.com/ for more information. We are a licensed, bonded, and insured locksmith with over thirty years in business in Chicago. "A" rating on Angie's list!