A classic mechanical puzzle if there ever was one. I call it a classic because it has been around for probably well over 100 years. It has been made by many companies and in varying quality from real cheap to strong and heavy. This one, made of cast metal, is excellent; and will stand up to lots of use. In fact, it would take a major effort to bend or break it. It has all the elements of a real good puzzle. It is relatively easy to take apart and put back together; once the “secret” is known. A good puzzle for all ages, and in no way daunting even to people who think “puzzles are too hard for me”. As to difficulty, it is Easy.
You can purchase this puzzle and get the solution at Puzzle Master.