All plates are a true 450 mm diameter with a 2" stainless steel center insert shaped to the bumper to properly distribute the force of the bar when dropped. Weighing within +/- 0.5LB of the stated weight. Each batch of 25LB - 55LB wright bumper plates are tested to exceed 20,000 drops from 6 feet. 10LB and 15LB are tested to 7,000 drops.
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