If turning the house of a friend you will find a spanner in the kitchen, for the most broken, know that there is nothing strange. It could be a piece of this nice set of tools, modified to become practical and curious opener.
These are real wrenches, in fact you can choose the size you like depending on how large you want the opener, a small size is the most comfortable to hold in the drawers, but a great will to the scene and will be more fun to make on the table.
A plumber or a handyman who often fiddles with these tools, you will feel at ease and could find this set very interesting.
Moreover, since the true wrenches, and having only the open part modified, have the ends for the bolts still usable, then depending on the needs pick you could also convenient for their original function.
The find etsy.com