Electroplated Diamond Core Drill Bits
Ideal for trades people, handy people and DIY for cutting glass, china, fibreglass, pottery, marble, porcelain tiles, granite, travertine, blue stone, fibre cement, poly carbonates and more.
Supplied with a hex shank, so will fit most drills.
These are to be used in rotary mode only ie not hammer drill.
These bits can be purchased individually (6 - 105mm).
Or we stock the HDEMK8 kit - 8 Piece kit with drill guide (4, 5, 6, 7, 8, 10 & 12mm bits).
$87 incl GST
| Part No | Diameter | Sell Price | Part No | Diameter | Sell Price | Part No | Diameter | Sell Price |
| HDEM6 | 6mm | $27 | HDEM32 | 32mm | $62 | HDEM69 | 69mm | $144 |
| HDEM7 | 7mm | $27 | HDEM35 | 35mm | $68 | HDEM75 | 75mm | $159 |
| HDEM8 | 8mm | $27 | HDEM37 | 37mm | $72 | HDEM77 | 77mm | $165 |
| HDEM10 | 10mm | $27 | HDEM42 | 42mm | $83 | HDEM82 | 82mm | $178 |
| HDEM12 | 12mm | $28 | HDEM44 | 44mm | $87 | HDEM85 | 85mm | $186 |
| HDEM13 | 13mm | $28 | HDEM50 | 50mm | $100 | HDEM86 | 86mm | $191 |
| HDEM16 | 16mm | $30 | HDEM52 | 52mm | $105 | HDEM88 | 88mm | $198 |
| HDEM19 | 19mm | $37 | HDEM60 | 60mm | $122 | HDEM89 | 89mm | $203 |
| HDEM20 | 20mm | $39 | HDEM63 | 63mm | $129 | HDEM90 | 90mm | $208 |
| HDEM25 | 25mm | $49 | HDEM67 | 67mm | $138 | HDEM95 | 95mm | $226 |
Delivery:
We ship Australia wide using Australia Post airbags. The Express bags are often overnight (depending on your area), and have a tracking number. You may be able to fit a couple of hole saws in the bags – feel free to call or email for a quote on freight.
Most of these bits, and the 8 piece kit, fit in a 500gram post bag.
Post Bags – (3-7 business days)∗
0.5kg 220 x 350mm $11
1kg 260 x 380mm $13
3kg 300 x 400mm $16
Express Bags – (1-2 business days)∗
0.5kg 220 x 350mm $14
1kg 260 x 380mm $17
3kg 300 x 400mm $20
∗Delivery times as indicated by Australia Post, and subject to variation.
Instructions:
Fit the hex shank fully into the drill chuck and tighten.
Use appropriate personal safety equipment - safety glasses, hearing protection etc
Use slow speed drills. A battery drill is much safer with water than an electric one. If using an electric drill, ensure you use an RCD to prevent electrocution.
Check our drill chart below for recommended speed.
| Core bit diameter | 12mm | 25mm | 50mm | 75mm | 90mm |
| Fibreglass | 1200rpm | 700rpm | 350rpm | 250rpm | 175rpm |
| Glass & china | 800rpm | 500rpm | 250rpm | 160rpm | 125rpm |
| Pottery tile & marble | 600rpm | 450rpm | 225rpm | 130rpm | 100rpm |
| Porcelain tile | 500rpm | 375rpm | 180rpm | 125rpm | 90rpm |
| Granite | 400rpm | 300rpm | 150rpm | 100rpm | 75rpm |
Clamp the material to be drilled firmly. Never hold the material with one hand while drilling with the other!
Apply plenty of water. Some objects can be barely immersed in water (beware water in the drill). Or try one of our water suction ring sets - see here
Use only medium drilling pressure. The smaller the diameter, the less pressure is needed (otherwise you will damage the core bit).
Withdraw bit regularly to allow cooling, allow water inside the hole and to clear debris.
A pilot drill bit is provided on larger diameter bits, but a simple template guide is just as fast.
Be aware that porcelain and glass may fracture and these can be very sharp.
Core bit damage will occur if:
- the drill bit gets too hot to touch
- drill speed is too high
- insufficient cooling water
The diamond crown will turn blue and the diamonds will strip off. This is not warranty, so follow these guidelines.
Drill Guides: Drilling holes in stone tiles or other hard, smooth surfaces is often hard to start, especially when working with the lubricants necessary for diamond hole cutters/drill bits. This drilling guide is designed to hold your bit steady so you can start the hole in the right spot without slipping or sliding. Both use a 120mm suction cup
Plastic (red): 8-80mm, with water injection point (for lubrication when drilling) $15
Steel (blue): 8mm to 54 mm $25
(Pictures show two guides in each photo - prices are for 1 each)
Please see our "Contact Us" page (here) for Australia wide shipping information.
Disclaimer: the information on this website is provided in good faith and believed to be reliable and accurate at this time. However, the information is provided on the basis that the reader will be solely responsible for assessing the information and its veracity and usefulness. UDT shall in no way be liable, in negligence or howsoever, for any loss sustained or incurred by anyone relying on the information, even if such information is or turns out to be wrong, incomplete, out-of-date or misleading.