They were giving away woven shopping bags in a town centre, emblazoned with a certain bingo establishment. In the bag was a few give-aways, one of which puzzles me as to its purpose...
It is a circular metal disk around 30mm in diameter, about 4mm thick, has a soft rubberised side and on the other the bingo places logo.
Wrapped around the edge is like a chrome chain, each with a section length of around 30mm, with a longer curved part at the end - opened out, it looks similar to a scorpion's tail. The fixing between chain and disk, allows the chain to be rotated in relation to the edge of the disk, or in fact to be wrapped tightly around the disk's circumference. What is it, what might be its purpose please?