[I won't comment on the individual bolt, so the text will be the same for the others]
The bolt puzzles are the first ones I have purchased from Rocky.
Next I’m getting the one of the boxes, keys, miniature vessel…basically at least one of everything. =) The quality is superb, customer service is superb.
Kind of hard to say anything specific about the individual bolt puzzles except they all are different in solution and approach but with basically the same goal obviously, remove the washer or nut. They are not all that difficult but FUN, and did I mention they look awesome.
More bolts can be found at Rob’s HUGE puzzle site