2pcs 3/4-Inch / 20mm Diamond Drill Bits, Small Diamond Hole Saw Hollow Core Drill Bits for Glass Ceramic Porcelain Tiles Marble Granite Quartz

This bit was a great value because it performed exactly as I had hoped. I used the bit to drill a hole to insert a spigot into a terracotta planter. The pot will be used with a rainchain to collect and divert roof runoff water. I used a regular handheld drill on fast speed at first to make an indentation into the pot and then I used slow speed to drill the hole. I poured water over the area about every 5 seconds to keep the pot from cracking. I found the bit easy to use because I didn't even have to press hard with the drill and I have small hands and am not partcularly strong. The hole (lol) process took less than five minutes and the bit seems barely worn. In the pictures, the worn bit is on the left. I used size 25mm for a 1 inch hole but had to enlarge the hole slightly because of the threads on the spigot; the 26mm bit would have worked better. I think I got my money's worth.

I was surprised these performed so well on my granite counter top considering the price! I thought I would go through all 5 bits but I successfully drilled through using only one bit. And it was sharp from start to finish!I used plenty of water to lubricate, and took a few breaks to let the bit cool down.

Worked to cut through an inch thick ceramic planter without causing damage. I don't feel right giving it 5 stars because these are obviously cheaply produced and not meant for longevity, but beyond that they did the job for a good price.

It works very well. I use it for drilling drain holes in china repurposed as flower pots.

These things are perfect for drilling holes in the bottom of my pots! Easy to follow the directions (youtube). Good value for the money. A hardware store tried to sell me something for $25.00. Seem to be durable also.

It may be my fault. Do not use for granite.

Used to drill ceramic tile. These are awesome. Well worth the money.

it's good these come in a 15 pack. I used 12 of them drilling several holes in marble and tile. The base material is soft/cheap, so it doesn't hold up. It overheats easily.But, they are inexpensive enough that it got the job done and I'm satisfied. NOT a professional's tool, but if you have a job or two to get done - these should work.