Martin 050 half coupler clamp.
From the Manufacturer:
Fits 48 to 51 mm (1 7/8 - 2 in) diameter truss Large contact area provides excellent grip May be used with any product that accepts a standard clamp Mounts fixture closest to truss Minimal wear and tear on truss Recommended for permanent installations Mounts with M12 bolt (included)
Specifications:
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Fits 48 to 51 mm (1 7/8 - 2 in) diameter truss
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Large contact area
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Recommended for permanent installations Mounts with M12 bolt