Pellor 1 Pair Aluminum Alloy 5 CM Olympic Barbell Bar Clip Weight Lift Standard Fast Locking Collar Snap Buckle Size: Olympic Barbell Standard 5 cm. Aluminum alloy made, lightweight and durable. Weight plate rapidly fixed for convenient operation. Exactly perfect fit with no looseness. More secure. Package includes 1 pair x Locking Collar Jaw Snap Buckle.