Introducing the KAMIKAZE brand dumbbell clips (spring collars). These are used to secure plates in place of shaft rings (screw collars). One of the advantages is that they don't need to be screwed in to be fixed, allowing for quick and smooth securing, which saves time when changing plates. Just a little note: Like all dumbbell clips, the diameter is made to be a tight fit, so there may be some resistance when pushing them onto a shaft with threads. Dumbbell clips (spring collars) are secured by the threads, so they may not be pushed in all the way, and the plates may wobble slightly, although it's not a major concern. You don't have to worry about them coming off even if you swing them around during exercises like kickbacks, but if you're concerned about movements where the dumbbell is above your head, like pullovers, we recommend using shaft rings. Dumbbell clips (spring collars) can be used to secure shaft rings. When performing exercises that involve rotating the dumbbell, the shaft rings may loosen, so using dumbbell clips (spring collars) on both sides can help prevent the shaft rings from loosening. 【Applicable Size】Suitable for general dumbbell shafts (barbell shafts) with a diameter of 28mm. *Please confirm the "diameter" of your shaft before purchasing.* 【Threaded Shafts & Smooth Shafts】Also suitable for W-shafts (EZ bars) and the like. 【Material Composition】Metal part: Spring steel; Clip part: Plastic This set is usually sold as a set of 6, but one has a defect, so it's a set of 5.