Review on Complete Hole Saw Kit With Diamond Drill Bits And Adjustable Guide Jig For Glass, Ceramics, And Tile - 15 Pieces, 6-50Mm Size Range by Matt Charlton

As a semi-pro, I had a bath remodel with granite and porcelain. To buy a pro set of diamond bits this large didn't make financial sense. There are a number of these less expensive sets available and I happened upon this one. Drilling some smaller diameter holes in porcelain killed these bits but I got what I needed. Drilling the larger sink drain and faucet holes in the granite was great. These bits did the job easily and still have plenty of tooth left for more. Good value for the money based on the material being drilled into.