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With the Powerhouse® Retainer Degree Gauge Tool, there’s no more guessing which valve locks to use with your retainers. Manufactured in the USA from high-quality aluminum, this tool precisely measures the degree of any steel or titanium retainer. It is able to measure 6°, 7°, Super 7 (8°), and 10° valve retainers and is anodized for added durability and long life. Plus, to aid in the identification, each angle is laser etched for easy visibility.