Easy Click Barbell Locks 30/31 mm (Set of 2)Easy Click Dumbbell & Barbell Fasteners for 30 31 mm Bars Secure Your Lifts! Thanks to its patented design, this innovative fastener promises compatibility with a wide range of Barbell Bars including all standard barbells, dumbbells, and threaded tricep bars. Made from first class material, these fasteners offer excellent grip and are very easy to attach. With the innovative twist lock, you can attach weight plates in seconds for efficient training