It does the job - JE Machine Tech AR-10 .308/7.62 Crush Washer

What else can be said? It's a crush washer and does the job it needs to do. Price is great too. Zero complaints and bought a few extra because you never know when you'll need one. Pros: price and works. Cons: none. Best used for: ahhh a crush washer. Why would you use it for anything else. And yes, I just needed to add that to hit 200 characters.