The Hit Fitness Clamp Collars for Olympic barbells and weight plates are an alternative to spring collars. The easy to use click and lock mechanic will keep plates secure on barbell during lifts. They will reduce the damage to barbells which can occur during the sliding on and off of other traditional collars. These collars are the ideal choice for serious lifters during high impact training such as Crossfit, Olympic lifting and powerlifting. They are sold in pairs and are 2 inch in diameter. Features Clamp Collars For Barbells Ideal for securing Olympic discs onto a 50mm bar. Easy to use and quick to secure. Click and lock to secure discs. No damage to bar upon securing compared to conventional spring collars. Sold in Pairs.