X1Tools Black-Oxide Corrosion-Resistant 18-8 Stainless Steel Nylon-Insert Locknuts / Stop-Nuts are made to resists loosening due to use or vibration without damaging threads thus prevent a fastener from backing off. (Also Known as lock nut, locking nut, self-locking nut, prevailing torque nut, stiff nut or elastic stop nut)