Lot of 20 Aviation/Aircraft  Screw Thread Insert NAS1834-3-540 NEW Specs at bottom of page Take a look at the pictures for exactly what you will receive. I am selling many other small aviation parts on eBay currently. Shipping cost for each ADDITIONAL item is $1.50 (within the U.S.) Pickup is always free in Bellingham, WA SPECS:

length: 13.8mm height,  14.1 mm width

 cadmium plated carbon steel