Check the listing for details. TonePros Pre-Notched TuneOMatic Bridge T3BP-N Nickel. Condition: New. Listed at 49.95 USD. The tone heard round the world. This is it, the guitar upgrade that started it all. The rock-hard foundation of the entire TonePros company, the TonePros locking bridge is the part that changed the face of the electric guitar parts industry. A universal improvement to any instrument, the TonePros locking bridge does not discriminate against musical styles, tastes, or preferences. The TonePros locking bridge is a must have for any tune-o-matic style guitar, regardless of price point. The greatest guitar players around the world count on TonePros bridges to keep them in tune, ready to go, and sounding great night after night. From an overseas copy to a ’59 replica, the TonePros bridge is a must have for any guitar. Thread: 5mm Metric (as used by Gibson on Nashville Models) Post to Post Spacing: 2.93 Inches/ 74.5mm Saddle Notch: Pre-Notched Saddles Saddle Material: Zmac Bridge Material: Zmac Post/Thumbwheel Material: Brass Radius: 12 Inch String Spread: Approx. 10.4mm Post Top Width: .15 Inches/ 4mm