Designed with total perfection, this pair of screw collars comes from the famous brand named Domyos. This brand is promoted worldwide, offering a range of fitness equipment and accessories as well as our holistic wellness products. These screw collars are constructed of heavy duty steel to make it sturdy enough to hold heavy weight plates. You can load these screw collars with standard weight plates and secure them in place. Moreover, these screw collars are crafted for plain rods, dumbbells, curl rods and more.