Package: 10PCS x square tube couplers High Quality Material - Steel, not easy to deformation, corrosion and rust, beautiful and practical, durable. Made from high-quality galvanized steel with a hot-dipped coating, the fitting resists rust, corrosion, and oxidation. Each fitting undergoes precision machining to ensure a tight, gap-free fit with square pipes Heat and pressure resistance, corrosion resistance. Features: - High Quality Thickened high-quality galvanized steel, strong pressure, durable wear. Square Tube End Caps,ULIFESTAR PVC Dock Post Caps,Black 10 Pcs Square Tube Coupler,ULIFESTAR Slip Square Tube Connector,Galvanized Square Tube Fittings,1mm/0.04''Thick Square Tubing Joints for Square Pipe (20 * 20mm/0.78"*0.78"-2 Way Tube Shelf, shelf production, business display, shop decoration, etc. Specification: Material:Steel Color:Silver Size:Inner Side Length:21mm/0., 82''. Reinforced steel pipe, higher strength. 3 Way Joint For Square Pipe 10 Pcs Square Tube Coupler,ULIFESTAR Slip Square Tube Connector,Galvanized Square Tube Fittings,1mm/0.04''Thick Square Tubing Joints For Square Pipe (20 * 30mm/0.78 * 1.18"-2 Way Tube Slip On Square Tube Fittings Multiple Specifications - You can choose from a variety of specifications, including straight line, 2 way, 3 way, T3 way, 4 way, 5 way, 4 way flat, 6 way.