Isn't it funny that you always seem to collect an assortment of keys. Some of them I have had for years and have no idea what lock they open. But I will never throw them out. They are fun to draw apart from anything else, and who knows when one day I find a padlock that I can't open because it needs one of these keys.
I like to draw collections of things... Just for fun, and to be a bit silly I threw in an alum key.
Biro in cheap sketchbook