These are Great Planes Brass Threaded Inserts (1/4-20)|
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
(4) Threaded Inserts
5/16" Drill Size (package says 3/8 but that is too large)
Standard Slotted Screwdriver (-)
Thread Size: ¼-20
Diameter: 3/8" OD overall
5/16" OD of main body
Package says it threads into a 3/8" hole. But it threads into a 5/16"
diameter hole that is ½" deep.
specs, bit size & comments updated tjt 072705