6 Sets 1 3/8 Inch(32-34mm) 90 Degree Structural Pipe Connector 3 Way Metal Joint Chain Link Fence Clamp, Stainless Steel 201 Corner Fitting End Rails Clamps, Thickness 1.8mm - Amazon.com
Amazon.com : 4 Way Flat Edge 1 3/8" Canopy/Batting Cage Fitting (FVF4) - Fits EMT Pipe or Chain Link Fencing Top Rail That has an Outer Diameter of 1 5/16" : Patio, Lawn & Garden
Amazon.com: Canopy Fittings Base Connector Fitting for 1 3/8" Pipe (6) : Industrial & Scientific