Nylon Lock Nut Design: This assortment kit features nylon locking rings that provide friction and elasticity, ensuring a secure fit between the nut and screw to prevent loosening. Simply tighten with a wrench for easy use. ? Durable 304 Stainless Steel: Made from high-strength 304 stainless steel, these lock nuts have a tight internal thread pitch, enhancing security and minimizing the risk of loosening. ? Comprehensive Metric SAE Sizes: The kit includes 366 pieces across 15 sizes: 6#32 (40 pcs), 8#32 (32 pcs), 10#24 (22 pcs), 10#32 (22 pcs), 1/4"-20 (16 pcs), 5/16"-18 (8 pcs), 3/8"-16 (4 pcs), 1/2"-13 (2 pcs), M3 (85 pcs), M4 (54 pcs), M5 (40 pcs), M6 (26 pcs), M8 (8 pcs), M10 (4 pcs), and M12 (3 pcs). ? Organized Storage: Comes in a sturdy plastic box with clear markings for easy identification of sizes and quantities, ensuring that nuts stay organized and accessible. ? Versatile Applications: Perfect for various uses, including repairing furniture, cars, and machinery. This locknut set makes a thoughtful gift for family and friends who enjoy DIY projects or mechanical work.