Kluson USA Replacement Wired ABR-1 Tune-O-Matic Bridge With Brass SaddlesThis is the Kluson USA ABR 1 bridge with the retaining wire and brass saddles available plated to match the frame or raw uplated. True to original mounting specs. The saddles are held in place with a thin wire securing the intonation screws and saddles into the frame. Adjustable in height with thumbwheels and threaded rod that uses no body inserts, just like the originals. Bridge stud diameter = 4 mm, smooth top Bridge center to center spacing = 2. 93