strength scale your project ends up falling. The series you end up using depends where on the weight vs. For each series we carry a single (20x20mm, 30x30mm, 40x40mm) and double (20x40mm, 30圆0mm, 40x80mm) wide extrusion. Phidgets carries three different series of T-Slot extrusions. T-Slot is a framing system composed of extruded aluminum profiles which use the namesake slot as a mounting point for various hardware components.