uxcell Structural Pipe Connector Joint Pipe Clamps 180 Degree 2 Way, 10 Set Stainless Steel Corner Fitting End Rails Clamp Fit OD 1-1/4 inch (31.75mm) Tube, Silver - Amazon.com
GCi STRONGER BY DESIGN G-16 Pinch Clamps for Inside Mount Tonneau Covers (4 Pack). Made with Structural Aluminum. Roll Up, Hard, Soft Covers and Tops on Pickup Truck - Walmart.com
Clamp on Tee Structural Pipe Fitting Manufacturer - HULK Metal