Description:Usage: Collars are easy and quick way to move your plates around, they also keep weight plates securely and safely while lifting.Application: For all 1 inch standard weight lifting barbells or dumbbell bars.Easy to Use: Easy and quick to remove, safe and secure to provide balance and stability.Durable: Made from robust and durable material for long lasting use.Package: Included 2 pairs of dumbbell hex nut for you to use.Specification:Material: plasticColor: blackSize(approx): 2.5cm/0.98inchPackage:2 pairs * Hex nut