Offered for your consideration is a lot of 3 different cast iron / steel gears. I believe they came out of an automatic transmission, but am not sure. Perfect for a steampunk project.

#1 - 3/4" Width x 2-1/2" Diameter - center slot is 3/8" wide x 9/16" long

#2 - 3/4" Width x 3-1/2" Diameter - center hole is just under 3/4" in diameter

#3 - 3" Width x 2-1/8" Diameter - center hole is just under 1-1/4" in diameter

Thank you for your interest and please let me know if I can answer any questions!