Radiator Bleed Key

I have made this Key during last winter in one day, when I needed to bleed my radiators, and I couldn't reach the screw with a screwdriver.It is very usefull to have one around the house.It is not expensive to buy one but why not print one if you have the chance. I have made this design in AutoCAD and It is open for everyone to have it and share it. I printed it with PLA but i guess it last longer if you print it with some stronger material.