Honoson 20 Pieces Diamond Drill Bits Set for Stone Twist Tip Drill Bit Heavy Duty Micro Set for Glass Tile Jewelry 0. 8 mm 1. 0 mm 1. 2 mm 1. 5 mm 1. 8 mm 2. 0 mm 2. 5 mm 3. 0 mm 3. 5 mm 4. 0 mm

These are very small. Worked great for drilling holes in a shells for wind chime.

As described. Seem to fit correctly.

These are not true diamond bits. Real diamond tipped bits don't even need these corkscrew groves. They do NOT drill thru several mediums that diamond tips should work for. These are regular drill bits dipped in something sparkly.

The drill bits did the job but it's taking almost as long as a regular drill bits to drill into flint.

I needed to make a hole in a round polished amethyst ball. Started out very small, made a pilot hole. Then gradually increased bit size until I hit the size hole I needed. Important to note, I kept watering the hole as I was drilling. Worked out very well. Otherwise, delivery was late, that's why I didn't give best rating.

I could drill into my beads before but the diamond surface really helps me to make them wider since the larger drill bit won’t fit in my hand jewelry drill. Works just like I needed!

perfect for the use i need to drill through stone and gems for jewelry making, recommend

Works very well.