UPDATE! It's been almost 3 years and these spacers are amazing. Not once did they loosen or break or anything like that. I entrust my life to these spacers. Literally. Daily. I would recommend it to anyone reliable and worth every penny! Bought in February, they've been in my Taxi 04 Silverado 1500ext ever since. Good product. Make sure you tighten them to your car's specs so they fit properly and that's probably why I made them so durable because I re-tighten them every 500 or so miles because after all we all have horror stories of adapters / shims have seen. I would highly recommend buying these, the only reason I gave 4 out of 5 is not for the product itself but for the long term effects on my or your car. Just be aware that you are stretching wheel traction and causing more than normal wear and tear on suspension components. For example I have had them since February of this year, they have lasted and lasted but my wheel bearings wear out far too quickly compared to without this product, not the fault of the seller or the product just the result of the game!