If you don't want to use this concrete drill bit only for foam, or you can limit your work to 2 or 3 short holes per drill bit, just ditch this junk product and buy a reputable brand drill bit. I've never had a drill bent. They break because they are made of hardened steel, and hardened steel is brittle. These bits are made of mild steel and are therefore non-structural. You're wasting money and time and you might need 5 kits to not even finish installing what you can do with a Bosch bit.
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