Silicone Caulking Nozzle with 4 mm gap

Added two tips to the nozzle that are 4,2 mm apart to act as a guide on 4 mm glass panels. This way you can easily get a clean bead of silicone.
I used it to convert an aquarium to a terrarium and attaching a lid to it. Put the nozzle over the glass panels, laid the silicone, put lid on and done.