The Wooden Camera LW 15mm Adapter comes with a 19mm Studio Rod Clamp and adapts 15mm lightweight accessories to 19mm studio spaced rods. The adapter's height is adjustable, so LW 15mm matte boxes with no height adjustment can be vertically aligned if necessary.
The 15mm posts on the adapter have 1/4"-20 threaded holes for adding bolt-on 15mm rods if longer mounting area is needed.