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![DU-BRO 4-40 x 1" Socket Head Bolt & Blind Nut Set - 129 - MPM Hobbies](http://mpmhobbies.com/cdn/shop/files/du-bro-4-40-x-1-socket-head-bolt-and-blind-nut-set-129-mpm-hobbies_436x436.jpg?v=1709533101)
For mounting engines, it includes 4 each of bolts, flat washers, lock washers, and blind nuts, plus one allen wrench. High-strength steel fasteners with 10 grams/pkg of weight.