If you're fooling around with trapeeze tailpiece 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 .795", head diameter .212", diameter on the main threaded portion is .125". The threads on these screws just barely clear the mounting holes on most Bigsby tailpieces and very securely hold those units in place.