we used these to hang things on walls when i worked for a tradeshow display company. the mating part was a rounded rectangle with a slot in it. I forget the technical name we just called them "hooks".
I knew I'd seen that in the last bit, we have them holding up a few large framed canvas in the house. lol :facepalm OOK | Professional Pictures Hangers
I knew I'd seen that in the last bit, we have them holding up a few large framed canvas in the house. lol :facepalm OOK | Professional Pictures Hangers
Selby interlocking flushmounts. that ook one is a modified one. same thing though...you can get the regular ones like on that helmet for around 80 cents apiece.