Jinnuo Star LOT 9 Pcs Set Diamond Hole Saw Drill Bit Set 10mm - 50mm Granite Glass Tile - Tools 9 Piece Diamond Dust Hole Saw Drill BIT for Ceramic Tile Marble Rock Porcelain

I am amazed how well these worked. I was thinking these would be a 50/50 shot of working but i was dead wrong. While these seem flimsy they worked amazing.I used these to drill 2 holes in a inch thick slab of granite and it worked perfect.Just to outline the process, I used a drill press and made a little circle of plumbers putty around where i was going to drill to hold water. I just applied light pressure with the press and it was through in less than a minute. The hole was very smooth and did not chip or anything.

The saw broke off the shank on the first attempt. Can't say I was too shocked. These feel very light and flimsy. Kept the cutting area drenched with water while drilling. Went to Lowes and bought one. Made three holes without any trouble at all.

Works fine for low duty cuts

Did 4 holes, so far so good. Great price