CAMVATE Rail Block 15mm Rod Clamp Base Plate This listing includes only the main unit and 1/4 screws. It's well-made and securely holds two 15mm rods. The screw knobs for securing the rods are on both sides, so some ingenuity may be needed for attaching equipment. I am selling this to organize my equipment. This is a used item, so I would appreciate it if those who understand this would purchase it. Thank you very much.