Machined to the exact dimensions as my original aluminum rivet head cap, only made of steel. The reasoning for this is steel would most likely be the material used on the real prop, either a nail of some sort or a custom made pin to fix the broken one. We will probably never know exactly what was used unless more, higher quality photos of the prop surface. The only thing we know for sure is the ANH prop has an unusually bigger rivet head than even the biggest Graflex INC. variation.

***PLEASE NOTE! These caps will rust if you do not keep it oiled, you will not have that issue with the aluminum version