Emivery 1Pcs 25Mm Standard Barbell Spin-Lock Collars Screw Clamps Dumbell Weight LiftingFeature: Made from robust and solid steel with plating finish, the dumbbell handles are heady duty and durable.Rubber O-ring inside star collars, collars stay tight, knurled handle prevents slipping.Easy and quick to swap plates with the spinlock collars. An eco..