I forgot what size drill bit I used to create the hole. I recommend adjusting a little to the part that fits your wall for a perfect match, or just a little less. Read my scripts below...DO NOT MAKE THE HOLE BIG! (If you're going through drywall) You want a tight fit so it doesn't pop out easily. In any case, you should reduce the size a bit and perfect it with an office knife. I did that and it came out perfect. This tip comes in handy when drilling into slabs of rock, as drilling removes more material than the chisel itself. If you're working with wood or some other hard, non-crushing material, choose the exact size of the nozzle and forget what I did mentioned about using a utility knife. The price was good compared to other providers.
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