Diamond Twist Drill Bits - 10Pcs Diamond Tipped Drill Bit Set Tile and Masonry Drill Bits High Speed Steel Rotary Tools for Wood Glass Stone Cutting 0.8-4.0mm

Brilliant

Nots so good broke on use

Good product - one snapped immediately

Ideal for my purpose

I do arts and crafts which I need decent drill bits to put holes through resin and semi precious stones to make jewelery ie very shiny shaped stone, well thes bits do not go through my stones and only managed to go part way befor cracking them

Bought as I wanted to attach a house number to a granite gate post. I was led to believe that a diamond tipped bit is best for granite. They barely made a mark in the granite. Tried starting off with one of the small diameter bits thinking this would penetrate more easily, and 'start things off' for the biggest bit. When I applied pressure it just snapped. When will I ever learn that a cheap price means poor quality?

Good quality, got through thick sea glass easy enough without any scorch marks or blowing the back out. Will buy again when these have worn out.

Well packaged fast service ideal for my project. Value for money good quality.