Twisted Nails Metal Puzzle _ Bundle of 4 Identical Puzzles Bundle of 4 Identical Twisted Nail Metal Brainteasers. See if you can separate the two Nails ! Rejoining the nails is just as problematic !! Tricky, fun, not to difficult brain teaser. Real, solid carpenters nails bent to exact specification. Four Identical Puzzles. Great for stocking stuffers, gift baskets, give-aways.