These are Great Planes Brass Threaded Inserts (6-32)
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: 3/16" Drill Size (package says ¼" but that is too large)
Standard Slotted Screwdriver (-)
SPECS: Thread Size: 6-32
Diameter: 7/32" OD overall
5/32" OD of main body
COMMENTS: Package says it threads into a ¼" hole. But it threads into a 3/16"
diameter hole that is 5/16" deep.