Pin·na·cle [pinək(ə)l] (noun) - the most successful point; the culmination. The Pinnacle locking system allows for maximum contact between the bridge and posts. Providing additional sustain and accentuates string attack. As with any locking bridge system, when you change the strings, the bridge stays place. The Pinnacle has a counter-bore (concave radius) on the bridge base top and bottom side of the mounting holes. The bridge posts/thumbwheels and caps have a matching convex radius. By mating the two radii, they make complete contact even when the bridge is not set up perfectly flat, as none ever are. If you're looking for the best, look no further. Individual Advanced Plating Pinnacle Tune-O-Matic bridge and two Pinnacle locking bridge posts for electric guitar. As seen on Gibson® High Performance (HP) models and Heritage®. Base Material: Aluminum Country of Manufacture: Made in USA Patent: #8,723,007 Radius: 12" Saddles: Notched Titanium String Spacing: 52mm Available in: Chrome w/ Titanium Saddles & Locking Posts SKU: 1219-1223C Gold w/ Titanium Saddles & Locking Posts SKU: 1219-1223G Nickel w/ Titanium Saddles & Locking Posts SKU: 1219-1223N Chrome w/ Zinc Saddles & Locking Posts SKU: 1217-1223C Gold w/ Zinc Saddles & Locking Posts SKU: 1217-1223G Nickel w/ Zinc Saddles & Locking Posts SKU: 1217-1223N ** MATCHING HARDWARE ** Pinnacle Locking Tune-O-Matic TOM Locking Bridge Posts Chrome SKU: 1223C Gold SKU: 1223G Nickel SKU: 1223N Pinnacle Locking Stop Bar Tailpiece (Aluminum) Chrome SKU: 1149C Gold SKU: 1149G Nickel SKU: 1149N Pinnacle Locking Stop Bar Tailpiece (Zinc) Chrome SKU: 1148C Gold SKU: 1148G Nickel SKU: 1148N Advanced Music Products (AMP) is a division of Advanced Plating, Inc (API). Engineering and manufacturing guitar parts for the titans of the industry. Made in the USA for over 60 years. OEM fit and finish. Trust the brand your favorite brand's trust.