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Designed to mount gear to round surfaces from 0.5"" to 2.1"" in diameter, the TetherTools Rock Solid Master Clamp is constructed of lightweight cast alloy, and features a built-in locking 5/8"" Baby socket that allows for dozens of attachments, and a 5/8"" Baby stud. A unique wedge insert lets it clamp it to any flat surface. This clamp is ideal for holding anything from cameras to Tether Tables.