Hello. Whether "catch" or "latch", whatever that part that is called that you install in the lid, as the foregoing repliers stated, use soft steel. You will never, in your lifetime, open and shut the lid enough to loosen the engagement. Riveting the piece through the lid is trhe traditional method. Make sure, after you have drilled the hole, and countersunk it, to use a 3-cornered needle file to file 4 compass-point notches in the countersunk hole. When you peen your soft steel stud catch/latch into the countersunk hole, some of the steel will enter the notches, preventing that sud from ever turning or lossening. Regards, Peter A. Alexander