Package of 10 - This insert is made of phenolic, with a barrel type design.  Threads are 1/2-20, and the barrel is used for alignment.  The .280 thru hole is designed for you to tap once installed.

Overall Length = 1.25
Backside Threads = 1/2-20
Threads Length = .741
Alignment Shoulder Diameter = .509
Alignment Shoulder Length = .7900
Thru Hole Diameter = .234

INSTALLING INSERTS:
Drill 3/8 Hole - 1.5" Deep
Bore Hole to .465 - 1.5" Deep using Boring Bar
Tap Hole with 1/2-20 tap to depth
Counterbore hole .750 deep with Boring Bar using NON-Threaded side of insert for your gage.
Apply insert with Epoxy - Let Dry - Then Drill / Bore / Tap ID threads to desired size.