40" Anodized aluminum crossbar and pair of gunwale clamps for canoe. Please look at all the photos to understand how these are used. They will not come with instructions, although we are available to answer questions. See other listings for other lengths. Crossbar: Measures 1 3/16" high x 2 7/8" wide x 40" long. Has holes spaced along the top surface to receive spring buttons of our accessories, like snap-in leeboards, rowing outriggers and stabilizer float arms. Also accepts Spring Creek slip-on wheels and stabilizers. Gunwale Clamps: Consists of a stainless steel u-bolt, heavy-duty aluminum L-bracket with holes in it for the legs of the u-bolt, and two star-knob nuts with brass threads. We also have them with a U-shaped bottom bracket, for the Mad River Adventure canoe and the Mycanoe canoe. If you need the U-shaped bottom bracket, just message us when ordering. U-bolt measures about 3 inches inside-to-inside between the legs and the legs are about 4 inches long. What's included: 2 gunwale clamps. 1 Crossbar. Feedback: Very satisfied with purchase. Answered my questions quickly and easy to work with. Fast shipping!Canoe Crossbar and Gunwale Clamps (#121919278600)Buyer: gwc1947 (101) May 2021