Read more 1-inch or 2-inch Inner Ring Diameter Each plate has 3 large openings with strips on them for easy grip. Labeled in both LB and KG for easy recognition. Weight plates can be used to perform muscle strengthening exercises and endurance training, or to increase flexibility and balance. BalanceFrom Cast Iron Weight Plates 1-Inch Center or 2-Inch Center, Standard or Olympic Made of solid cast iron with a 1-inch or 2-inch center hole fits any Olympic bar with diameter 1" or 2” or less; Can be used with 1" or 2” dumbbell bars too. All plates features a durable, baked enamel finish to prevent the plates from rust and corrosion without any unpleasant odor. 1" or 2" inner ring diameter Total diameter: Vary by sizes Cast iron plates Read more Different Diameter The total diameter of the plate varies by size for easy recognition. Weight Selection Choose preferred weight from 2.5 lbs, 5 lbs, 10 lbs, 25 lbs, 35 lbs, 45 lss. 1-inch or 2-inch Inner Ring With 1 or 2-inch center, Plates fit any Olympic bar with diameter 1" or 2” or less. Read more Easy Grip Plates have deep edges for easy grip and comfortable workout. Cast Iron Made of high quality cast iron with a durable, baked enamel finish. Pound All plates are labeled in Pound for convenience. Read more