Check the listing for details. Advanced Plating Inc (API) Pinnacle Locking Stop Bar - Aluminum. Condition: New. Listed at 38.41 USD. Advanced Music Products (AMP) is a division of Advanced Plating Inc (API). They manufacture products 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. 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. Individual Pinnacle secured lightweight stop bar. To be used with Pinnacle TOM and ABR-1 bridges. 1.1 oz. Aluminum. Patent #8,723,007. Available in: Chrome 1149C Gold 1149G Nickel 1149N