Diamond Core Drills

Diamond Core Drills – Electroplated Diamond Drill Bits for Stone, Glass, Tile & Marble

Premium electroplated diamond core drill bits engineered for precise, clean hole drilling in stone, tile, glass, marble, concrete, and ceramic materials. The hollow core design removes the core plug for faster, cooler cutting with continuous water cooling. Compatible with hand drills, drill presses, and rotary tools. Use with a water swivel adaptor for continuous water feed through the hollow core during drilling.

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Product Format Guide

Drill Type Diameter Range Shank Type Best For
Electroplated hollow core drill 6mm–50mm+ Straight shank (6mm, 10mm, 12mm) Stone, glass, tile, marble, ceramic — general wet drilling
Sintered diamond core drill 6mm–50mm+ Straight or tapered cone shank High-volume professional drilling, longer service life
Diamond wire hollow drill bit 0.8mm–4mm Straight shank Ultra-fine precision holes in stone, glass, and gemstones

Material & Speed Selection Guide

Material Hardness Recommended Speed Cooling
Glass (art, plate, fused) Mohs 5.5–6 300–600 RPM Continuous water, essential
Ceramic tile, porcelain Mohs 6–7 400–800 RPM Continuous water, essential
Marble, limestone Mohs 3–4 600–1200 RPM Continuous water
Granite, hard stone Mohs 6–7 400–800 RPM Continuous water, essential
Lapidary stone (agate, jasper) Mohs 7 300–600 RPM Continuous water, essential

Compatible Applications

  • Stone drilling — agate, jasper, granite, marble, slate, sandstone, and lapidary stone slabs
  • Glass drilling — art glass, fused glass, stained glass, plate glass, and optical glass
  • Ceramic and porcelain tile — clean, chip-free holes for installation and mosaic work
  • Marble and natural stone countertops — professional wet drilling for plumbing and fixture holes
  • Pendant and bail holes — 1mm–6mm precision holes in stone slices and cabochons for jewelry
  • Hand drills, drill presses, and rotary tools — straight shank for universal tool compatibility

Related Tools

Frequently Asked Questions

  • Q: How do I drill a hole in glass without cracking it?
    A: Use a diamond core drill at 300–600 RPM with continuous water cooling. Start at a slight angle to establish a groove, then straighten to vertical. Apply light pressure without forcing. Never drill dry — heat is the primary cause of glass cracking.
  • Q: What size diamond core drill do I need to drill a hole in stone for a pendant or bail?
    A: For pendant holes in stone, use 1mm–3mm for small bail holes in thin stone slices, and 4mm–6mm for larger holes in thicker cabochons. Use diamond wire hollow drill bits for ultra-fine holes (0.8mm–4mm). Always drill wet at low speed.
  • Q: How do I drill through porcelain tile without chipping the surface?
    A: Use a diamond core drill (not carbide) at low speed with continuous water cooling. Place masking tape over the drill entry point to reduce surface chipping. Diamond core drills are the only reliable tool for clean, chip-free holes in porcelain tile.
  • Q: Can I use a diamond core drill with a regular cordless drill for drilling stone and tile?
    A: Yes — diamond core drills with standard straight shanks are compatible with cordless drills, corded drills, and drill presses. Use the lowest speed setting, apply light steady pressure, and keep water flowing over the drill point.