Heavy diecast string bar is 82.54mm wide, 16.30mm string to string spacing. I measured 145mm length from the front of the string bar to the back side of the hinge. Hinge is held tight to the wire frame only by string tension. Mounts to end of guitar by two oval head screws and one strap button with an appropriate screw. We include three nickel plated steel mounting screws as depicted. Hard to find tailpiece!