Review on 🔩 5-Pack of M8x60mm Stainless Steel External Hex Expansion Bolts by Yasorn by John Gray

The 8MM anchor requires a 12mm hole in concrete to be secure. This is slightly larger than 7/16. Not having a 12MM percussion bit I used a 7/16 bit to drill into the concrete and "wobbled" it a bit as I was drilling down to create a slightly oversize hole. You have to be careful though as too much "wobble" will result in a slightly oversize hole which means grip strength will be reduced. If you need stainless and need to be able to take down what you have secured and not have a stud sticking up to trip on this will work well. Suggest you buy a metric percussion bit and use a hammer drill.