Extruded aluminum is ok, thickness isn't critical
Aluminum Type 6063 is prefered but 6061 is acceptable.
Qty is 32 of these disks
Thickness 1/4 inch
Diameter 3 inches
4 holes 1/4 inch each drilled
chamfered or radiused outside edge of disk
Shipped to Michigan
.iges file is on my dropbox
https://www.dropbox.com/s/ig7jgkxhf7...Disk.iges?dl=0
Picture is below