Bits and Pieces - Bolted Close Brainteaser Puzzle - Wooden and Metal Brain Game for Adults Bolted Closed is a handheld brainteaser made of wood and metal. Your goal is to remove the metal ball that is bolted into position by the bolt and nut. A great gift for people who love brainteasers and trick puzzles. Brainteaser puzzle measures 3-7/8" x 2-1/4" x 2-1/2" Solution included