The Mega Slim Coupler is a lower profile option for smaller light fixtures. It is half the size of our standard Mega-Coupler and weighs 30% less yet fits the same as the Mega-Coupler. The Mega Slim will fasten from 1-1/4" pipe (1.66 OD) to 2.050 OD Truss Tube. Has a wide wing nut for easy fastening of the coupler to the pipe or tube. Has hex pocket for 3/8" bolt. Includes 3/8?×1? zinc plated bolt with nylock nut and spring washer. The bolt does fit flush into the Coupler.