3-Way T-Joint Plastic Corner Connector for Aluminum Square Tubes Fast, Strong & Solder-Free Connection for 3D Aluminum Frames Build three-dimensional aluminum frames faster and with less processing. This 3-Way T-Joint Plastic Corner Connector is designed for aluminum alloy square tubes and provides a simple solution for creating 90-degree three-dimensional frame connections without welding. With three perpendicular connection interfaces on the X/Y/Z axes, aluminum square