The 90Kg Tri Grip Olympic Disc Kit comprises the following: Body Power TRI-GRIP Cast Iron Olympic Discs – 10kg (x2) (Individual product code: CNODTG1000) Body Power TRI-GRIP Cast Iron Olympic Discs – 15kg (x2) (Individual product code: CNODTG1500/2) Body Power TRI-GRIP Cast Iron Olympic Discs – 20kg (x2) (Individual product code: CNODTG2000/2) Their easy grip Tri-Grip design allows for a quick change over when adjusting weights, fitting onto any Olympic bar, machine or attachment. They are suitable for commercial and home gym use. Disc dimensions are as follows: 10kg: 12” diameter x 1.5” thickness 15kg: 13.5” diameter x 1.5” thickness 20kg: 15” diameter x 2” thickness Our BodyPower cast iron plates are made to an incredibly high standard, with all products undergoing strict quality control. The casting quality, surface treatment and weight tolerance must meet a set standard of quality. Some of the cheaper alternatives that are available on the web are inferior products, which are not constructed to this same standard.