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The ElipticWrench was designed to replace an entire drawer of random perch tools we accumulated over the years. The tool's elliptic curve fits a variety of spring perches and lock rings, ranging from 2.5" to 4.5 " (63 mm-115 mm) in diameter.
The hooked end positively grasps the notches on lock rings or round holes in perches. The nickel-plated steel design and long lever handle allow you to "tap" as needed to break free stubborn rings. Do that toolbox junk drawer a favor and get the perch tool to rule them all!