Diamond grit mini core drills for wet use on porcelain, ceramic, glass and plastic. Nickel plated finish. Available in sizes from 6mm to 40mm, with size-specific guides for plugs, pipes and waste fittings.
Size
QTY
Price
QTY
6mm
1
£3.95£4.74
7mm
1
£4.90£5.88
8mm
1
£5.25£6.30
10mm
1
£6.25£7.50
12mm
1
£8.53£10.24
16.5mm
1
£9.90£11.88
18mm
1
£10.90£13.08
22mm
1
£11.75£14.10
25mm
1
£13.50£16.20
30mm
1
£12.90£15.48
35mm
1
£17.60£21.12
40mm
1
£24.25£29.10
6-18mm cores blade
7
£29.95£35.94
Wet mini diamond core tile drills are the go-to solution when you need clean, accurate holes through hard tile without cracking it. Whether you’re drilling for red plugs in ceramic wall tiles or cutting a 40mm opening for a sink waste through grade 5 porcelain, these diamond grit edge drills do the job properly. The nickel plated finish adds durability, and the range covers everything from 6mm right through to 40mm, so you’re not swapping to a different tool mid-job.
These mini cores are suitable for glass, plastic, ceramic, and the hardest grade 5 porcelain tiles. Grade 5 is the stuff that kills standard TCT or carbide drill bits, and it’s increasingly common in bathrooms and kitchens specified by architects and interior designers who’ve never had to actually drill through the stuff themselves. These wet mini diamond core tile drills handle it without drama, provided you use them correctly.
The wet part matters. Water as a coolant isn’t optional here — it’s what stops the diamond grit from burning out and keeps the cut clean. Without water, you’ll overheat the drill and wreck the tile edge. A small dam made from plumber’s putty around the drill point works well if you’re not using a drill guide with a water feed. A steady trickle from a sponge also does the job on vertical surfaces.
Where Wet Mini Diamond Core Tile Drills Get Used
These are designed for professional installation work in bathrooms, kitchens, and wet rooms. The size range isn’t random — each diameter corresponds to a practical trade application. The 6mm to 8mm sizes cover standard wall plug diameters. The 10mm works for blue plugs and mini core pipe runs. Move up to the 16.5mm and 18mm sizes for 15mm copper pipe, then 25mm for 22mm copper, 30mm for 28mm copper. The 35mm handles 1¼ inch waste pipe, and the 40mm is your size for sink waste and shower head outlets.
Using These With a Cordless Drill
These drill well with a good cordless drill, which makes them genuinely useful on site without trailing leads across a bathroom floor. Keep the speed low, disengage the hammer action entirely, and use rotary mode only. Hammer action on a tile will crack it regardless of how good the drill is — that’s just physics. Low speed, steady pressure, and consistent water cooling will get you through even the densest porcelain without fuss.
Pro Tip: When drilling on a vertical tiled surface, build a small dam of plumber's putty around the drill point to hold a pool of water as coolant, keeping the diamond edge cool and the tile edge clean throughout the cut.
These mini core drills are used by tilers, plumbers, bathroom installers and kitchen fitters wherever holes are needed through hard tile. Common applications include drilling for wall plugs and fixings, passing copper pipe and overflow pipe through tiled walls, cutting outlet holes for shower heads, and making sink waste openings. They work on ceramic wall tiles, glass, plastic sheet, and the hardest grade 5 porcelain floor and wall tiles found in modern bathrooms and commercial installations.
Best For
Grade 5 porcelain tiles
Ceramic wall and floor tiles
Glass
Plastic sheet
Bathroom and kitchen installations
Plumbing penetrations through tiled walls
Size Applications
6mm: Red wall plugs
7mm: Brown wall plugs
8mm: Nylon plugs
10mm: Blue plugs / mini core pipe
12mm: Basin fixing sets
16.5mm / 18mm: 15mm copper pipe
22mm: 19mm overflow pipe
25mm: 22mm copper pipe
30mm: 28mm copper pipe
35mm: 1¼ inch waste pipe
40mm: Sink waste / shower head
Key Specifications
Diamond grit cutting edge
Nickel plated finish
Wet use only (water coolant required)
Rotary drill action only
Low speed operation
Compatible with standard cordless drills
Sizes from 6mm to 40mm
Not suitable for: Not suitable for use with hammer action or SDS drills. Do not use dry — water coolant is required at all times to prevent overheating and premature wear of the diamond edge.
Always ensure the drill is set to rotary mode with hammer action disengaged before starting. Apply water continuously to the cutting point throughout the drilling process. On horizontal surfaces, a small ring of plumber's putty around the drill point holds a pool of water effectively. On vertical surfaces, a wet sponge held nearby or a purpose-made drill guide with water feed works well.
Start at a slight angle to create a small notch, then bring the drill upright once the guide groove is established. This stops the drill from skating across the glaze. Keep speed low and let the diamond edge do the work rather than forcing the drill. Excessive pressure generates heat, shortens drill life, and increases the risk of cracking the tile.
Set your drill to rotary mode and disengage the hammer action completely
Mark the centre of the hole with a chinagraph pencil or tile marker
Build a small putty dam or attach a drill guide around the mark to retain water coolant
Fill the dam with water or keep a wet sponge in contact with the drill point throughout
Start drilling at a slight angle to score an initial groove in the glaze
Bring the drill upright once the groove is established to prevent skipping
Maintain low speed and light, steady pressure throughout the cut
Keep the water coolant topped up continuously until the drill breaks through
Can I use these mini diamond core drills without water?
No. Water is essential as a coolant when using these drills. Running them dry will overheat the diamond grit edge very quickly, dramatically shortening the life of the drill and increasing the risk of cracking the tile. On vertical surfaces where holding water is tricky, a wet sponge kept in contact with the drill point throughout the cut is a practical alternative to a putty dam.
Will these drill through grade 5 porcelain?
Yes, that is exactly what these are designed for. Grade 5 porcelain is the hardest tile type commonly found on site and it will destroy standard carbide or TCT drill bits quickly. The diamond grit edge on these mini core drills cuts through it cleanly when used wet, at low speed, in rotary mode only. Larger format grade 5 porcelain tiles are common in modern bathrooms and these drills are a reliable choice for that work.
These mini core tile drills use a diamond grit cutting edge bonded to a nickel plated steel barrel. Diamond abrasive cuts hard, brittle materials by controlled abrasion rather than mechanical shearing, making it effective on materials that chip or crack under conventional drill bits. The nickel plating provides corrosion resistance, which matters given that these are used with water. Suitable for drilling tiles rated up to and including grade 5 on the PEI hardness scale.
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