The 17.5Kg Olympic Disc Progression Kit comprises the following: Body Power Cast Iron Olympic Discs – 1.25kg (x2) (Individual product code: CNOD0125/2) Body Power Cast Iron Olympic Discs – 2.5kg (x2) (Individual product code: CNOD0250/2) Body Power Cast Iron Olympic Discs – 5kg (x2) (Individual product code: CNOD0500/2) Virtually indestructible, these Olympic Plates are machine bored for a precise fit, complete with a satin black enamel finish and a 2” diameter hole for Olympic Bars only (not included). Disc dimensions are as follows: 1.25kg: 6.5″ diameter x 0.5″ thickness 2.5kg: 8″ diameter x 0.5″ thickness 5kg: 9.5″ diameter x 0.75″ thickness