Matthews 18" Furniture Clamp 429584 are also known as Bar Clamps, a rough adjustment is made by releasing the spring loaded lock and sliding the adjustable half of the clamp over the serrated bar.
Final tightening is done with the worm screw handle.
The Bar Clamp Adapter, included, slides over the bar and tightens with two thumb screws. Bar Clamp Adapters are also sold separately.
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