Heavy Duty Galvanized Steel Fittings with tightening eyebolts, 4pcs, welded connections Our 1 inch fittings have an inner diameter of 1 1/4 inches which works with 1 inch EMT pipe that has an outer diameter of 1 3/16 inches. You can get this pipe at most hardware stores Great for: Top and bottom of set ups, flat top canopy set ups, flea market booths, craft fairs, batting cages, golf simulator cages, garden trellis, clothing racks, banners, sukkah kits, green houses