Square tube clamps are used to join square tubes to create structures. Tube clamps are incredibly easy to use as the components are joined by a grub screw which simply requires an Allen key, or hex key as it is often called, to tighten. No other fabrication processes are required. Our range includes the following fittings: elbow, 3 way through, short and long tee, wall flange, railing base flange, adjustable cross, ground socket, double inline swivel, and handrail bracket.