Use this Double Tee Nut to connect V-Slot and most T-Slot Extrusions end to end or use it on any connection point that has 20mm spacing (for example, the Actuator End Caps).You can use these double tee nuts just like you would a standard tee nut to make any connection that you need.Double tee nuts are compatible with any 5mm screw or attach the double tee nut with 2x 4/5mm set screws (not included) to allow for a nice low profile solution that will let the OpenBuilds Wheels transition from one extrusion to the next.