Difficulty - Hard but not Extreme on the Enigma scale.
The puzzle is to screw the nut to the bolt. At first glance this looks impossible but it is possible.
The puzzle comes with a printed solution when you buy it.
Beware the nut is on the wrong side of the washer and head of the bolt. The pieces are on one continuous unbroken chain which is knotted around the large ring. Sorting out all these pieces into the right order is quite a difficult disentanglement challenge.Size: The bolt is 30mm long. The diameter of the nut is 10mm.