This puzzle comes from a famous puzzle designer from the Netherlands: Wil Strijbos.
Wil is more "specialized" in metal puzzles (even if he has made many bottle puzzles), most often puzzles that you can't see what you're doing.
I will review many puzzles from Wil. The first challenge when you order from Wil is to open the package! It is very well wrapped (luckily) with a lot of scotch tape. So you try to find the beginning of the tape because you fear that if you use a knife to open the box, you could damage the puzzles inside the box...No worries: the puzzles inside the box are very well protected !!
Back to the puzzle:
The puzzle is made of a spanner, a metal chain and a metal ring. The goal is to free the metal ring, just as simple as that! The spanner could have been used to screw nuts in a previous life (even if I doubt because it seems very new), but now it is used as a puzzle ;-)
3 steps are needed to solve this puzzle. The puzzle is easy but fun to solve and fun to have for its unusual design. You can let you friends play with it without fearing that they could damage it because it is very sturdy.
Wil made another smaller spanner with a plastic ring. It is solved the same way as the big spanner, and if you want both (good luck to find the smaller one though...), you should begin with the bigger spanner. Because as it is more fragile (not a metal ring but a plastic one), you could hesitate doing things...
This puzzle is not expensive but it's not because puzzles are expensive that they are good. Often, you can have some more fun with the cheapest puzzles...This is a good example.
So I recommand this puzzle. Not for its puzzling aspect if you like difficulty, but for its unusual shape.
If you want it, contact Wil. You can find his email address by searching on Google.
Remember, Google is your best friend.