7Pcs/Set Diamond Grinding Carving Needles Gem Stone carving tools for Gemstones Jade Ceramics Glass Metals

Grinding needle diameter: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm.
Shank diameter: 2.35mm
Total length: 42-48mm.

 Package includes:1.5mm*1, 2mm*1, 2.5mm*1, 3mm*1, 4mm*1, 5mm*1, 6mm*1.

Made of electroplated diamond and high-quality alloy. It has high hardness, is sharp and durable, and has a long service 
life.

Widely used for surface grinding, trimming and polishing of jade, ceramics, glass, gemstones, metals, etc.