This extruded aluminum gusset is designed to work with 40 Series Metric Extrusion. These gussets are ideal when holding your extrusion perpendicular is critical. Using a Roll in T nut with a 16mm Buttom Head Cap would be an ideal way to attach this gusset to your extrusion.This extruded aluminum gusset is designed to work with 40 Series Metric Extrusion. These gussets are ideal when holding your extrusion perpendicular is critical. Using a Roll in T nut with a 16mm Buttom Head Cap would be an ideal way to attach this gusset to your extrusion.