This is a great matte box! It's light and versatile. It works well as a clamp-on and with a 15mm LWS setup.
It has a 105mm clamp on it, and comes with a 95mm adapter, a 95mm clamp ring, 105mm to 77mm and 72mm clamp rings that screw onto the end of the lens, and a top flag. The screw-on clamp rings have been used once, and the top flag is brand new.
It holds two 4" x 4" filters (one rotating), not 4x5.65.