Horizontal Weight Plate Storage Racks

 Each plate storage rack is 43.4" long x 9" wide. The 5 big spaces are 4.25" and the 6 smaller spaces are 2.5". 45lb iron weight plates are just over 1" thick so you should be able to fit 20 of them on 1 rack along with all your plates under 45lbs filling in the remaining 6 spaces.