Hook Closure From Windscreen Wiper

A useful accessory that can be used as a keyring, to hang a cell phone or MP3 player, to keep together rings or washers ....

A strip of steel spine from a windshield wiper, a piece of iron wire 14 or 12 gauge (1.5 to 2mm), nippers, round nose and flat nose pliers.
You can get windshield wipers from free in a scrapyard. Wiper blades contain 2 stainless steel strips that are very flexible.

Bend one end of the strip into a half circle, this will hold the iron oval
Bend the strip to a "U"  shape and cut it to the lenght you choose.
Start making a small circle on the other end, but do not close it, leave enough space to insert the iron wire.

Take the iron wire, make an "L" shaped bend on one end, try and make it sharp, it will revolve inside the strip's circle.
Insert the circle of the strip in the shorter end of the wire to determine where to cut it.
Cut.
Bend the wire to a half oval shape on one side and draw it near the pivot's end.
Do the same on the opposite side and cut to measure.

Insert the oval in the circle.
Squeeze the circle to close it on the pivot.
Bend the oval to the right curve and refine the shape of the steel strip.

Done!
To see more: www.pennabilli.org