If you're fooling around with trapeeze tailpieces and hinged vibrato units you need good screws to mount them. These screws are getting to be hard to find in bright nickel so we bought a boatload of 'em. I measured overall length .690", head diameter .165", diameter on the main threaded portion is .123". Threaded portion measures approximately .625" length overall. I include these screws with Gretsch Electromatic 0062745000 tailpieces; the holes are so small that only a "2 X 18" size screw like this will work.