hole, it fits Olympic bars with diameter of 2". Effectively avoid bouncing and protect the floor by choosing high-quality materials. Labeled in both LB and KG for easy recognition. Weight plates can be used to perform muscle-strengthening exercises, endurance training, or to increase flexibility and balance. 225 LB Barbell Set Total: 1x 7-foot Olympic 2-inch barbell bar (45 LB), 4x 10 LB, 2x 25 LB, 2x 45 LB Bumper Plates.