M4 Bolt Nut Head

Just a remix of one of these knurled knobs. Customized to hold a hexagonal nut for an M4 bolt. I made the hexagonal hole diameter 7.25mm in diameter and 3.25mm in depth. I also added a through hole with a diameter of 4mm for the threaded rod of a bolt to go through. Please post a make and like if you use it!