The Bodypower Tri-Grip olympic weight plates have an easy grip tri-grip design that allow for a quick change over when adjusting weights, the plates will fit onto any olympic bar, machine or attatchment. The plates are of a high, durable quality suitable for commercial and home gym use. 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