While changing out three overhead chandiliers I sought help from a lighting store near by. The chains holding he lamps need adjusting. I was afraid, these being antiques, that I would damage the chain. The lighting tech was quick to make the fix’s with a pair of these pliers. Spread the link with the tips, squeeze it with the area behind the hinge. Had never see a pair, Had to have one.
These are called “Chain Pliers”. Nifty!
-- Bill, Michigan "People don't come preassebled, but are glued together by life"