A standard Olympic weight set usually includes an Olympic barbell, weight plates, and locking collars. The barbell is generally 7 feet long and weighs about 20 kilograms (44 pounds). Weight plates come in different sizes, commonly including 2.5 kg, 5 kg, 10 kg, 15 kg, 20 kg, and 25 kg plates. Some sets may also include rubber-coated plates, storage racks, or benches. Olympic weight sets are designed for strength training, bodybuilding, and competitive weightlifting exercises.