Keep your weights secure during workouts with the fast-locking Cortex Alpha Series Olympic Magnetic Collars. Made from commercial quality aluminium, these collars are built to last and offer superior clamping power. The high strength magnets make them easy to store on your rack or rig, making them easy to find when you next need them. The black interior lining also helps protect your bars, weights and collars. Compatible with any Olympic bar, dumbbell, or 50mm sleeve.GENERALSuitable for Olympic sized bars 50mm diameterMaterial: AluminiumQuick ReleaseMagnetic properties allowing maximum holdBlack Rubber interior lining to protect bar and collars36mm wideWARRANTY: 12 Months Parts replacement warranty