I have no right to rate this tool, it is the first concrete hole cutter I have ever used. He made 5 holes in the 40 year old concrete, each about 4 inches deep. I am sure he will make 9 more holes for my project. I use a 10,000 R/M angle grinder, 1/4" water flow, a $19 router speed controller, and personal protective equipment. For less than $50 it will make all the holes I want.