most of my hubs i make from 1-1/2 to 1-3/4 6061 or 7075,not sure exactly but thats what the metal co i buy it from thought it was.i might be wrong about the 7075 and it might be the one thats closer to the 6065 but i dont remember the number.i like my face that the prop sits on a little bigger than some people.the prop hub i have extra the face is 1-1/4 in diameter and its 1-1/2 " long with a 5/16 bolt.the bolt hasnt been center tapped for a spinner setup.Its brand new but i bought it from someone else before i bought my lathe.if ya need one that fits all the way over the crank like tims in his pic i havent done one of those yet but scott at brillelli.com makes them for poulans all the time.maybe tim or someone else on this thread or do a search on hubs and maybe someone else makes them.im going to try my first one next week after i buy some new stock.