TUNAMATIC BRIDGE NICKEL Gotoh Tune-o-Matic Bridge Fits For Gibson ABR-1, Nickel String span: 2 1/16 inch (52mm) ; Mounting posts ctr/ctr: 2 59/64 inch (2.93 mm) ; Bridge stud diameter: 5/32 inch (4mm) Item Number: GE101BN Available At Ant Hill Music!