This knuckle adapter incorporates a 25mm diameter post of approximately 150mm length. The bore for the transverse portion of the adapter is 31.29mm in diameter. It fits the horizontal boom of some of the earlier Sciencscope boom stands, and may fit some other brands as well. The knuckle joint allows the inclination to be set through a range of 180 degrees. The clamp lever is articulated so it may be swung out of the way. There is a keeper nut at the end of the post.

These posts are in excellent condition.

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