Material: Diamond
 
Head Shape: cylinder with concave surface.
 
Grit: Coarse(about 120 grit) , Fine(about 500 grit)
 
Size: 3mm , 4mm , 5mm , 6mm , 7mm , 8mm , 9mm , 10mm , 11mm , 12mm , 13mm , 14mm , 15mm , 16mm , 17mm , 18mm , 19mm , 20mm , 21mm , 22mm , 23mm , 24mm , 25mm.
 
3mm diamond burr Shank diameter 3mm , 4mm diamond burr Shank diameter 4mm , 5mm diamond burr Shank diameter 5mm

6mm - 25mm diamond burr diameter 6mm

Usage: it is used for rounding tools, making round beads, trimming and shaping, and grinding small spikes of round beads by machine. Fine sand is often used for low hardness jade or fine grinding 

Characteristics: Iron-plated high-quality diamond sand layer, uniform and full of particles, wear-resistant and durable, not convex sand
 
Coarse : 
Used for initial sanding and shaping, probably around 80 mesh When using, please add water, the grit will be used for a longer time
 
Fine： 
After the completion of the initial sanding, used for polishing about 500 mesh sand is considered to be relatively thin 

Attention: 

1: Because the emery is relatively coarse slightly hit the hand will grind off the skin of the hand, it is recommended to wear finger protection and other protective tools.
2: professional production is a jade block cut and chamfered rounded corners and then use the nest beaders rounded, can effectively extend the service life of the nest beaders, (refused to jade square directly with the nest beaders rounded, time-consuming and laborious, the grinding head does not get sufficient cooling, easy to damage!)
3: When grinding, we should add water from time to time to prevent the beads from wearing out too fast or the beads from burning black.
4: For safety, please turn down the speed of the machine when making.