Review on Adjustable Countersink 2 8×10 3 2×10 Wrench by Terrance Duncan

Tried several drills/countersinks. 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!