Replacement nuts for your axle. If you find yourself either losing your axle nuts or constantly having to tighten them, it might be time to replace them! 8mm is the size found on most plates being made today. 7mm is found on older dance plates made by Snyder, some older Sure Grip, and on anything European. If you aren't sure what size you need, email us at firstname.lastname@example.org to find out!