The LO Ink Rod Clamp opens wide enough and has enough clamping power to hold metal/wood level rods, fiberglass rods (SQUARE, ROUND, OR OVAL), prism poles, or any other objects less than 2" across. Because it DOES NOT COVER THE FACE OF THE ROD you can now do level runs with it. It fits on a regular tripod using the 5/8-11 threaded stud. The clamp jaws open 2" wide and exert 50 lbs of clamping force and have plastic covered tips to protect the item clamped. The clamp weights 1lb. and is 14" overall and is made of a 1 1/2" X 1/2" aluminum base plate with a metal clamp. Tripod not included.