FJM Security C2400AM-KA Medium Tubular Cam Lock with Stainless Steel Collar Ring and Chrome 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 11/16 long and can fit a material thickness of up to 7/16  it is a standard size cam lock with  diameter Chrome 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