BOX of 5 Nails Puzzles IN Wood Box by Professor Puzzle _ Bonus Style &ldquo;Menace&rdquo; Mini Wire Puzzle Professor Puzzle Presents 5 unique heavy metal nail puzzles. Hardware for the Brain ! Moderately tricky puzzles. Four styles require separating and then re-joining two identical pieces. The 5th puzzle "BED OF NAILS" requires balancing Six Nails on the Head of a Seventh. It is extremely tricky. Attractive wood presentation box with individual compartments. Sliding plexiglass top. Bonus: 1 additional metal take apart puzzle. Style "M" for menace.