4mm Diamond Core Drill Bits for drilling stone or glass [Size: 4mm]

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262 units in stock

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Buy 5 to 19: Pay $3.65
Buy 20 or more: Pay $3.00

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Pick-up from store (not shipped) - $0.00
Pickup from our Warehouse in Glen Innes by appointment only. Please advise date/time in order comments.

Plated Diamond Core Drills for drilling stone, marble, glass or tile.  Photo shows sizes available.
Discounted price if you buy 5 or more pieces.

  • 2mm diameter
  • 3mm diameter
  • 4mm diameter

Diamond drills can be used in a rotary tool such as a Dremel or in a drill press for making small holes through stones.  Using a drill press is easier to keep the bit straight and avoid breakage.


You will need to drill a hole to hang a stone by a cord, leather or jewellery finding.  Always use a coolant (usually water) when working with these drill bits.  This will help increase the life of the drill bit and give you better value.  We also recommend that you wear eye protection such as safety glasses.


Do not force the drill bit, let the diamond do the cutting and drill at a slow to moderate speed. Drilling too fast will just wear off the diamond plating prematurely.  Take the drill bit out of the hole you are drilling frequnetly and flush with water to remove debris.  Resharpen occasionally using an old carborundum wheel.


SKU 450
Shipping Weight 0.0010kg
Shipping Width 0.050m
Shipping Height 0.010m
Shipping Length 0.010m
Shipping Cubic 0.000005000m3

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