FJM Security C2400AL-BLK-KA Large Tubular Cam Lock with Stainless Steel Collar Ring and Black Finish, Keyed Alike The FJM Security cam lock comes with a chrome collar ring that shrouds the lock head helping to prevent attacks on your lock via prying or wrenching The collar ring is constructed out of durable stainless steel and has a handsome chrome finish  it will stand up to harsh weather and any attack The cam lock with the collar ring is 15/16 long and can fit a material thickness of up to 11/16  it is a standard size cam lock with  diameter Black tubular cam lock (sometimes called the ace cam lock) comes keyed alike with two keys per lock - each key will fit with each lock that you purchase Cam lock ships with collar ring, two keys, a steel cylinder nut, stop cam, 1-1/4" cam and cam nut - the tubular lock is constructed of zinc alloy and is chrome plated