Pictured above is the MSCB with 3/8" Hex Head Bolt. 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. It has a wide wing nut for easy fastening of the coupler to the pipe or tube as well as a hex pocket for 3/8" bolt. Includes 3/8″×1″ zinc plated bolt with nylock nut and spring washer. The bolt fits flush into the Coupler. The Mega Slim Coupler is also available with a 3/8" or 1/2" Flat Head Countersunk Bolt.