The Cast Iron Olympic Plates are offered in pairs of 2.5, 5, 10, and 25 LB increments and sold individually in 35 and 45 LB. Additionally, we offer a full set of 245 LB. Each plate features a 50.5 mm collar opening, which fits Olympic-size barbells. The 2.5 LB plates are 15mm thick, while the 45 LB plates are 38mm. The classic design and clang of steel plates are a staple for any home or commercial gym, simply a must-have for any serious gym owner or workout fanatic.