Brass 5/16 inch diameter ball with a heavier duty #8 chain.

Length of Unfinished Brass # 8 chain is 8 inches, just snip the extra off . 

If you need this larger size , ICTVintageLight has it here!

Smaller 1/4 inch ball, with #6 bead chain, works for most shades. Brass and nickel are available.