Hard as Nails _ Twisted Nails Puzzles _ Bundle of 5 Unique Puzzles Bundle of 5 unique disentanglement style separate the nails puzzles. Made from real solid steel nails (designed and twisted to exact specifications. ). Includes the: "nail biter"; "nail jail"; s-nail"; last nail in the coffin"; original twisted nail puzzle. Four puzzles packaged individually in attractive packaging. Twisted nail puzzle comes in plastic bag. Objective for all 5 puzzles is to separate the two pieces and then rejoin.