Barbell spin-lock collars are made from robust and for long lasting use, and it is your best . Usage: Barbell clamps can keep weight plates placed securely and safely while lifting. Nice replacement of old. Widely Applicable: Perfect for bumper plate use, and platform lifting workouts. They will fit 25mm standard weight lifting barbells or dumbbell . Craftsmanship: The thread polishing is done very carefully, and the buckle is tighter, so that you can avoid unnecessary injuries during exercise. Suitable : Spin-lock collars fit for kinds of weight lifting barbells dumbbell training gym sports.