The 18-10s and 20-10s are 3/4 to 7/8 thick, hub dia is 1 5/8 to 13/4 inches, the prop hub adapters I make for mine are 1 1/4 in dia, the biggest one you can put in a 3 inch plastic dubro spinner with the 4 bolts in it is 1 5/8. This is on the back side of the spinner, if you make it any larger it hits on the bosses for the nuts that hold the spinner cone on. hope it helps ya. STeve