Regular, or standard plates, have 25.4mm diameter holes and are intended to be used with regular or standard bars that are designed to accept plates with 25.4mm diameter holes. It is designed for home use.
Weight plates provide for a great deal of flexibility during your workout. You can easily adjust the amount of weight you are lifting by changing the number and size of plates on your weightlifting bar.
You can go heavy or you can go light by simply removing the weight collars and adjusting plates accordingly.
It is designed and manufactured by RIGIDIRON Fitness in the Republic of South Africa.