This hole saw has done the job! We were working on installing prefabricated half inch sheets of plywood to the ceiling of our house and needed a sharp hole saw to cut through the material for the can lights. This hole saw helped. We've made about 50 holes without noticing any sign of blade dulling or material cracking. I bought two of these, expecting to have to swap them out to keep the finished cuts, but the second one wouldn't even open.