Power Systems Olympic Spring Barbell Collars, Pinch Spring Collars for Olympic Size Weight Training Bars, 2-Pack, Steel Chrome  (50440) 2 inch diameter clamps for Olympic bars Holds Olympic plates securely in place Approximately 1 pound per pair Steel chrome clamps sold in a pair Weight training accessory for speed, agility, strength, power, running, football, volleyball, basketball, baseball, soccer and all other athletic, fitness, weight, or cross training