Review on 🔨 Enhanced Precision Wood Adjustable Countersink Drill Bit Set: 6 Sizes, 2-inch by Gary Lucas

I've tried several drill bits/chisels. This is the best I've found. I admire the countersink part, they seem to work forever in difficult materials. Drills dull quickly in cement board, but large 3.2mm drills are available and inexpensive. Just replace as needed. I wish they came in larger sizes!