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

This is a good set if you just want to do some crafting around the house. I had them drill holes in some of the pots. I've had no problems with terracotta urns, but I've had thick china urns that they just won't cut, water or no water. I wanted to convert them into planters. Of course I bought another set of diamond tips beforehand to use on the same urns and they didn't cut any holes either. Husband says it's probably because I was trying to use a tool that was battery powered and unplugged. Since the Council hasn't messed things up in any way, I think they're probably right. They stood against that thick china, they just didn't cut it. They just got really hot. There is nothing in the kit where they could be used. I was able to use them on thick plastic where I needed air holes and it worked well. So they were good on plastic, terracotta and ceramics. I can't speak for thicker porcelain because I think it might work, but I'd need a non-battery powered power tool to try this.