Suitable :Spin-lock collars fit for kinds of weight lifting barbells dumbbell sports.Really a great. 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 or lock nut with this . Widely Applicable: 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.