Made in U.S. Modern spec tune-o-matic bridge. No retaining wire. Plated, preslotted saddles. Hardware included This bridge is a great upgrade replacement that features wider intonation adjustments and a larger mass for better tone and sustain. It is a drop in replacement that requires zero modifications in standard Gibson models that use ABR-1 style bridges. Thread = M5 - 0.8 Metric (as used by Gibson on Nashville Models) Post to Post Spacing = 2.93 in. (74.5mm) Saddle Notch = Center Notched Saddles Saddle Material = Zmac Bridge Material = Zmac Post/Thumbwheel Material = Brass Radius = 12 inch Post Top Diameter = .195 Inches / 4.95mm Bridge Center To Center Spacing = 2.93 inches Saddle Spacing = 10.4 mm