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
Standard Slotted Screwdriver (-)
SPECS: Thread Size: 10-32
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.