20Pcs Drill Bits Diamond Drill Hole Lapidary Drilling For Jewelry Agate

Specifications:
Material:Diamond sand
:silver
Length:36mm
Diameter:1mm
diameter:0.6mm
Applications: jade, agate,, crystal, jewelry,
ceramics, glass, semiconductor material drilling

Note:
When using，you need the speed ≥ 20000,Smooth,
with mills, lifting mill, small bench drill to use

Package include:
20pcs Drill Bits










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