Material: Made of from robust and durable material for long lasting use. Anti-slip Spin-lock Collars: Come with anti-slip silence gasket, can reduce the noise generated by the disc hitting the magnetic pole. Usage: Barbell clamps can keep weight plates placed securely and safely while lifting. Easily can slide on and off the barbell. Application: Perfect for bumper plate use, and platform lifting workouts. They will fit all 25mm standard weight lifting barbells or dumbbell bars. Great Gift: Fit for kinds of weight lifting barbells dumbbell bars training gym sports. Really a great gift for lifting lovers.