These are Brass Threaded Inserts from Du-Bro.
FEATURES: Brass threaded inserts.
The perfect way to put threads into wood & mount engines to wood
mounting rails.
Threaded inserts make a simple & effective 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
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