I had to drill about 350 1/32 holes on one side of a 1/2 inch PVC garden watering pipe. I've barely drilled all of the 10 in this product, 50% of them broke or blunted within a few dozen holes. The other half barely made it, but still I had to buy more to match the holes. I've never used bits that small before and had to break a few to realize I need to move carefully, slowly and perfectly straight for them to work.