Review on SE Diamond Hole Saw Set (10 PC.): Premium Quality for Efficient Cutting - DH09HS by Jason Dahlkemper

I take into account that they cost less than $16 for a 10-bit set. This is quite surprising considering a quality diamond hole saw costs more than a bit. Even the mandrel on my wood drill bits cost more than this whole set. The drills arrived in 2 separate plastic bags. Both packages in a box. They weren't very protected from themselves, and there were slivers of diamond sand at the bottom of both bags. It wasn't much, but it was enough to mention. All bits were still fully coated along the cutting edges. The bits cut pretty well considering. The larger ones are so large that materials like porcelain stoneware can be difficult to get into. They may tend to migrate across the surface before forming a cutting groove for the fit. These bits cut a few holes well and then show signs of wear and slowdown. You can see the glue holding the diamond grit on it. This is an amber color. I would say if you only need to drill a few holes this is a good option. If you need a professional racquet then this set is not for you. Given the cheap price I would say it is very good value for money. 4 stars.