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The SunwayFoto DLC-50 50mm (1.76") Duo-Lever Clamp is an Arca-Swiss-compatible quick release clamp with a screw knob and a lever on each side. It can be adjusted to fit Arca-Swiss QR plates from a variety of manufacturers like RRS, Kirk, Markins, etc. The screw knob adjusts the width of the clamp and the lever is used to lock the clamp. The DLC-50 has a built-in bubble level.