Young Red Haired Girl With A Barbell Equipment

All Olympic plates of 10 kg or more are 450 mm in diameter. 450 mm versions also exist of the lighter 5 kg and 2.5 kg plates to accommodate the proper starting position for weaker athletes. These can be aluminum or plastic and may have rubber edges.
• Collars
Standard collars can be of any material, usually metal, and they can weigh up to 2.5 kg each for both men and women.
A bar with a pair of collars, the plates not counted, can weigh as much as 25 kg for men and 20 kg for women depending on the collars.