Heavy Duty Galvanized Steel Fittings with tightening eyebolts, 6pcs, Welded connections Our 1 3/8 inch fittings have an inner diameter of 1 3/8 inches which works with 1 3/8 inch EMT pipe or chain link fence top rail that has an outer diameter of 1 5/16 inches. You can get this pipe at most hardware or fencing stores Protects surfaces from pipe, holes can be used to secure to surface using tent nails, rebar, etc. Great to use for umbrella stand, flag stand, light pole, etc.