Dubro Threaded Insert 4-40 (4)

These are Brass Threaded Inserts from Du-Bro.

FEATURES:
Brass threaded inserts.
The best way to put threads into wood & mount engines to wood
    mounting rails.
Threaded inserts make an easy & reliable way to make wing hold
    downs.
These can be used where blind nuts are hard to fit.

INCLUDES:
(4) Threaded Inserts

SPECS:
Thread Size: 4-40
Length: 7mm