These are Great Planes Brass Threaded Inserts (10-32)

Features

Brass construction
The perfect way to put threads into wood and mount engines to wood
mounting rails. Threaded inserts make a simple & effective way to
make wing hold downs.
Can be used where blind nuts are hard to fit
Comes in a Parts-Pak clear plastic box with resealable lid
One year quality guarantee

Includes

(4) Threaded Inserts

Requires

¼" Drill Size
Epoxy (GPMR6042)
Standard Slotted Screwdriver (-)

Specifications

Thread Size: 10-32
Length: ½"
Diameter: 19/64" OD overall
15/64" OD of main body

Comments

Package says it threads into a 3/8" hole. But it threads into a ¼"
diameter hole that is ½" deep.

specs, bit size & comments updated tjt 072705