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![DU-BRO 4-40 Nylon Insert Lock Nuts (Standard) - 170 - MPM Hobbies](http://mpmhobbies.com/cdn/shop/files/du-bro-4-40-nylon-insert-lock-nuts-standard-170-mpm-hobbies_436x436.jpg?v=1709533089)
Zinc-plated, aircraft-quality nylon insert lock nuts. 4/pkg with a weight of 0.5 grams.
Made in USA