321pcs Nylon Lock Nut 304 Stainless Steel Assortment Kit1. [Nylon Lock nuts assorted]: A locknut, also known as a lock nut, locking nut, self locking nut, prevailing torque nut, stiff nut or elastic stop nut, is a nut that resists loosening under vibrations and torque. 2. [Quality]: Made from 304 stainless steel, these locknuts have good chemical resistance and may be mildly magnetic. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power
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