The Cast Iron Olympic Weight Plates by Titan Fitness® are offered in pairs of 2.5, 5, 10, and 25-pound increments. 35 and 45-pound weights are sold individually, and we offer a complete set of 245-pounds. Each plate features a 50 mm collar opening, which fits Olympic size barbells. The 2.5-pounds plate is 15 mm thick, while the 45-pound plate is 38 mm. The classic design and clang of steel plates is a staple for any home or commercial gym, simply a must-have for any serious gym owner or work out fanatic!