Sold as a pair, the Aluminium Lock 50mm Collars (Pair) Barbell Collars are made with aluminium with a red anodised finish. Lightweight yet strong, these Aluminium lock collars come in a red finish and are simple to use. Keep your bumper plates locked on safely with SMAI aluminium lock collars. Specifications Suitable for use on Olympic 50mm diameter barbells. Aluminium lock collar Durable nylon grip inside the collar to protect and grip your barbell TPE clamp 9cm x 9cm x 3.5cm Weight: Approx 200