I've been working on a project that required a special aluminum extrusion and had to order a minimum quantity, which is more than I need for my project. I'm selling off some of the extrusions I don't need to help offset the cost of the project. Outside dimensions are 1.5"x2.75" and the track fits all brands of track clamps, as well as 1/4"-20 hex head bolts. They were originally designed to be used with sawhorses for a portable track saw/panel cutting station, but have many other uses. For more info. check out TrackTubes.com. These are high quality, anodized extrusions that were "Made in the USA." I will cut to size and can ship up to 92" via UPS. Price is $5 ft. plus shipping. Email with any questions. Thanks.