Nothing else competes with the pure strength, quality and design of these IWF industry-standard Olympic weightlifting competition plates. Stainless-steel insert and durable solid ‘Virgin Rubber’ will not bend orcrack through the high torque of Olympic-weightlifting movements.Also, they won’t damage Olympic training platform Diameter of hole is 50.44mm, Outer diameter of the disc is 450mm(IWF standards) Colour coded for easy identification: 10kg (green), 15kg (yellow), 20kg(blue) and 25kg (red) Each disc calibrated to 1% weight accuracy Two-year warranty