300 Grit Diamond Burr - 50 Pc Set Grit:300g Approximate Size of 1 pair:

Approximate Size of 1 pair: 9cm x 7

When the fluid cooled the silica was deposited as gemmy chalcedony and quartz

5cm Approximate Weight for 1 piece: 690g

is buried under sediment and then subjected to heat and pressure over millions of years

300 Grit Diamond Burr - 50 Pc Set Grit:300g Approximate Size of 1 pair:Description: These Diamond plated rotary burrs with finer 300 grit points are excellent for sanding stage and removing the coarse grinding scratches and chips. They prepare the workpiece well for pre polish stage. For use with motor tools, drills, and flex shafts. Made In: China Head Size: Assorted Head Shapes Include Sphere, Cylinder, Flame, wheel, inverted cone, etc. Shaft Diameter: 1 8" (3mm) shank Overall Length: 45mm Case Size: 11cm x 10cm x 5.