This product is a set of self-locking nuts for use with various barbells and dumbbell bars. Made from cast iron materials, these nuts are durable and resistant to wear. They are also finely crafted for easy installation and a secure fit. Plus, they are an way to upgrade your gym equipment. Features -Color:Multi -Material:Cast iron -Size:5.00X3.50X3.00cm/1.97X1.38X1.18in -The practical design of the home dumbbell and barbell bars allows for compatibility with a wide range of weights. -Its self-locking mechanism ensures that the weights stay securely in place without slipping. -The use of cast iron materials in its construction its durability and performance. -The product is easy to install and remove, providing added convenience for users. -It is a practical option for upgrading your household gym and can be used for an extended period of time. Package list: 1 x pair of nuts