Steel Tube Connectors by Marni bemark, - ▻▻▻▻▻ STEEL TUBE CONNECTORS ◅◅◅◅◅ You can now build strong steel structures with 25mm square tubing without welding or expensive equipment. The perfect DIY product.
Indital Stainless Steel Fitting Connector for Square Tube 1-9/16" x 1/16" - Curves & Fittings