These are Great Planes' 4-40 Blind Nuts.

Features

Metal construction with zinc plating to prevent rust from oxidizing
on parts.
The perfect mounting nut for hard to reach areas
Perfect for engine mounting, landing gear, cowls, hatches, etc.
Comes in a Parts-Pak clear plastic box with resealable lid
One year quality guarantee

Includes

(24) Blind Nuts

Requires

1/8" Drill Size
CA Glue (GPMR6002)

Specifications

Thread Size: 4-40