Famous Twisted Nail Puzzle ..or.. Bent Nail Puzzle ..or.. Separate the Nails Puzzle.. has been around for over 150+ years. The object is to separate the two nails AND then return to original hooked position. A tricky puzzle that is apt to stump one for a few minutes. Nails are approximately 2 1/4 inches long. Solid, rugged puzzle. When you get real good attempt to do it behind your back and baffle your friends! A great stocking stuffer. Perfect for gift bags, give-aways, prizes, ice-breakers, thinking-seminars and other creative uses. Recommended for ages 13 to 105 years. This is a Bundle of 4 Identical Bent Nail Puzzles. The pieces between puzzles are interchangeable (as the design of each individual nail is identical) Return of complete bundle required for any return to process.