Does what it's supposed to do. - Yankee Hill Machine 5.56mm Crush Washer For 1/2 Inch Threads YHM-28-5C-W

I prefer a peel washer because a crush washer is very hard to crush. Unfortunately peel washers were out of stock. Other than that it's a simple piece of hardware that does what it's supposed to do. That's why I gave it five stars. There is nothing more to add.