30Pcs 0.4mm Diamond Drill Bits Small Burr Hole Saw Jewelry Tools for

The diamond coated hole saw suitable for use in drill hole on jewelry, gems, glass, marble, tile or granite

Product Specification:

Product Name: Lapidary Diamond Drill Bits, Diamond Drill Bits for Stone, 0.4mm Gemstone Drill Bits

Head diameter:  0.4 mm

Total length: 1-21/32" (42mm)

Drill depth:  1/8" (3mm)

Shank diameter:  3/32" (2.35mm)

Suitable for electric nail drill, carving machine, machinery supporting assembly with a 3/32" collet

Quantity:  30 Pcs

Drilling speed: Drill a hole in seconds

Use with water as a lubricant

Quick Tips

1.  Please add water for coolant and drill slowly

2.  Never use drills while machine is in hammer action.

3.  Holes Require No Futher Work As Cutting Is Clean 

We Can List Any Size (Hole Diameter from 0.4mm - 230mm) & Amount Of This Product

Just a friendly reminder: The Shank diameter of grinding bit is 2.35mm (3/32" inch)

There are two different collet sizes for Dremel: 3mm (1/8") or Universal 3-jaw chuck

If your chuck of Dremel(models 4300-8050) has an Universal 3-jaw chuck, then the grinding bit can be installed directly

However, it is NOT suitable for dremel with 3mm 1/8" chuck(such as:models 3000,4000)

If your chuck of Dremel is 3mm (1/8"), maybe you need add the Universal 3-jaw chuck for Dremel