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To each his own, your choice but McGard has black lug nuts as well as locks in black. I bought both from Jegs for my C6. Not sure Chevy has them in black but they are less expensive under the McGard name which is who package them for Chevy. The finish holds up very well.
I have used McGard for years, always had good luck. Of course I can't know how many thefts they prevented, but they never rusted and always came off OK. Tried Dorman on the C7, went to take them off to install the rotor cooling rings, and the key broke. Luckily I had a spare key. Bought McGards.
Someone asked me why the C7 came w/o wheel locks but my wife's Escape had them. I think it is to prevent wheel theft when the car is parked in the dealer's lot. Since Vette's don't sit outside at the dealer, locks are not needed.
I bought the McGard wheel locks for my 2006 C6, then transferred them to my '08, '10, and now my C7. I agree that a skilled thief can overcome the locks easily, but it just makes me feel better having them on, plus, I am very careful where I park my Vettes.
Some will say they will not save your wheels. I say anything that makes it harder to get them off is a discouragement and worth the cost. Here's what I use:
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