WRF - Pair - Aluminum Barbell Collars for all 2" Olympic Bars by War Room Fitness Extremely Durable - Aircraft Grade Aluminum. Far superior to the plastic or metal spring type clamps. Non-Slip lining built to hold the wights in place. Not just a great looking piece of equipment but safer for Bodybuilders, Weightlifters, Powerlifters, Crossfitters or anyone brave enough to challenge the iron! Fits all 2" Olympic Bars with quick locking and releasing action. 2 Year Warranty on locking mechanism offered by War Room Fitness Only 0.4lbs Each