NEO TOOLS Diamond Hole Saw Set 18/22/27/35 mm, 4-Piece, M14 Thread, Dry Drilling for Ceramic, Porcelain, Stoneware, Glass, Marble, Granite, Terracotta

Tile installers and plumbers working on bathroom renovations often need clean, precise holes in hard materials like porcelain or granite. The NEO TOOLS 55-318 diamond hole saw set provides four common diameters — 18, 22, 27, and 35 mm — for drilling through ceramic, stoneware, glass, marble, granite, and terracotta. Each hole saw features an electroplated diamond coating on a high-quality steel body, delivering clean cuts without chipping. The M14 thread mounts directly to standard angle grinders, and dry drilling means no water cooling is required, keeping the worksite clean and efficient.

Key specifications

• Set includes 4 diamond hole saws: 18 mm, 22 mm, 27 mm, 35 mm
• Cutting edge: electroplated diamond coating
• Body material: high-quality steel
• Shank type: M14 thread for angle grinder
• Drilling method: dry drilling (no external water cooling required)
• Working depth: approximately 30–35 mm
• Suitable materials: ceramic tiles, porcelain, stoneware, glass, marble, granite, terracotta
• Application: drilling holes for pipes, cables, and fixings in hard materials
• Packaging: blister pack or plastic case

Why choose it

Diamond-coated hole saws outlast traditional carbide grit versions and produce cleaner edges with less breakout, especially in brittle materials like porcelain and glass. The M14 thread ensures a secure, wobble-free connection to your angle grinder, and the ability to drill dry saves time and avoids messy slurry. With four sizes in one set, you're ready for most standard pipe and fixture installations without buying individual saws.

Ideal use cases

• Drilling holes for water supply lines and drain pipes in tiled walls
• Creating openings for electrical boxes and recessed lighting in stone or tile
• Installing grab bars, towel racks, and other fixtures in bathrooms
• Cutting holes in glass blocks or decorative stone panels
• Making clean penetrations in granite or marble countertops for faucets

Good to know

While designed for dry drilling, occasional water cooling can extend the life of the diamond coating when working on extremely hard materials like granite. Always use a low-speed setting on your angle grinder and apply steady, moderate pressure. The set comes in a protective case or blister pack for convenient storage and transport.