Review on 🔩 Efficient CooPee Rotary Drilling Concrete Masonry for Precision Construction by Andrew Griggs

I've only used a 5/8" drill bit so far but it holds up very well. After about 50 holes in 4 1/2" thick concrete, it still performs very well. It's not as sharp as unused bits, but wear is minimal. I soaked the bit in a bucket of water for about 10 seconds after each hole fall, which prevented overheating.