The Silicon Carbide dies that I had to make the broaches for one inch thick.The broach was .187 if I remember correctly. I've still got a couple of old ones out in my toolbox. As was said, we made them out of Drill Blanks. The first cut (tooth) was just a little squared to the pilot hole and became progressively squarer as it approached the last tooth, by .002. The last tooth left a .093 corner radius. BTW, All sockets are broached on both ends (I/2" Square drive end and the 12 pt driven bolt end)
Terry