Our 45, 35, and 25 pound plates are 1.4" thick. The 10 pound plates are 7/8", the 5 pound plates are 5/8", and the 2.5's are just under 1/2" thick. 45 pound plates: 1.4" thick, 17.375" diameter 35 pound plates: 1.4" thick, 13.75" diameter 25 pound plates: 1.4" thick, 11" diameter 10 pound plates: 0.85" thick, 9.25" diameter 5 pound plates: 0.65" thick, 7.75" diameter 2.5 pound plates: 0.45" thick, 6.25" diameter