![Need to join 2 perforated square metal tubes at at 90 degree angle and limit rotation at that joint. Any ideas for how to connect the two pieces of tubing, aside from Need to join 2 perforated square metal tubes at at 90 degree angle and limit rotation at that joint. Any ideas for how to connect the two pieces of tubing, aside from](http://i.imgur.com/7wZxKoL.jpg)
Need to join 2 perforated square metal tubes at at 90 degree angle and limit rotation at that joint. Any ideas for how to connect the two pieces of tubing, aside from
![Steelworks 1-1/2-in x 3-ft Zinc-Plated Steel Perforated Square Tube in the Tubes department at Lowes.com Steelworks 1-1/2-in x 3-ft Zinc-Plated Steel Perforated Square Tube in the Tubes department at Lowes.com](https://mobileimages.lowes.com/productimages/ab7ef564-e46e-47fb-a9ef-4d958e82abbe/00444052.jpg)
Steelworks 1-1/2-in x 3-ft Zinc-Plated Steel Perforated Square Tube in the Tubes department at Lowes.com
![Perforated Round Tube, Perforated Square Tube, Perforated Rectangular Tube | Tube Pierce Manufacturing Perforated Round Tube, Perforated Square Tube, Perforated Rectangular Tube | Tube Pierce Manufacturing](https://www.tubepiercemfg.com/wp-content/uploads/2019/02/capa-custom-perf-tubes-1.jpg)
Perforated Round Tube, Perforated Square Tube, Perforated Rectangular Tube | Tube Pierce Manufacturing
![China Perforated Steel Hollow Section Tube China Hot DIP Galvanized Coating Square Tube manufacturers and suppliers | Minjie China Perforated Steel Hollow Section Tube China Hot DIP Galvanized Coating Square Tube manufacturers and suppliers | Minjie](https://cdn.goodao.net/minjiesteel/powder-coated-square-tube-41.jpg)
China Perforated Steel Hollow Section Tube China Hot DIP Galvanized Coating Square Tube manufacturers and suppliers | Minjie
![16F1224PG 1-3/4" Square X 24FT Length Telespar Telescoping Square Tubing - Perforated - Pre-Galv Finish 16F1224PG 1-3/4" Square X 24FT Length Telespar Telescoping Square Tubing - Perforated - Pre-Galv Finish](https://www.kellyhayes.com/media/catalog/product/i/m/image_1-931548_28.jpg?quality=80&bg-color=255,255,255&fit=bounds&height=265&width=265&canvas=265:265)