6th Scale Icons made these in the past, but I am not sure Fields of Armor is making them now. Fields of Armor bought the 6th Scale Icon line and has started producing some of the parts but not all. These 1.72 thread are really close to 1/16 scale. I took a photo showing them side by side with Mitsoal's 1/16 scale photo etch wing-nuts from their Panther G set. As you can see the 6th Scale Icon 1-72 thread wing-nuts are real close and are self threading.