A key model with a triangular D-profile. It is often used in electrical boxes, as well as in shelters and rubbish bins. The side of the triangle measures 7.5 mm. Outer diameter: 14.5 mm. Depending on your needs, you can scale it up or down in the software. A 1 mm thick brim has been added at the bottom to prevent the key from detaching during printing. It can be cut off as it is held in place by millimetre-sized tabs.