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Diamond Cup Burrs for Carving (1mm–6mm)

Diamond Cup Burrs for Carving (1mm–6mm)

Eternal Tools

SKU:DFORM1

Our Diamond Cup Burrs are precision-coated carving burrs designed for shaping, details in glass, stone, ceramic, shell, wood, bone and other hard materials. 

Also known as ball-forming cup burrs, they are suitable for carving spheres, eye and circle shapes, round dimples, hemispherical hollows, texturing effects and shaping.

  • Available individually in ten sizes from 1mm to 6mm, or as a 6-piece set (1 each of sizes: 1mm, 2mm, 3mm, 4mm, 5mm, and 6mm)
  • High-grade diamond electroplating for precise, even cutting
  • 2.35mm steel shank – fits most micromotors, Dremel and rotary tools
  • Works on glass, stone, ceramics, enamel, shell, bone and metal
Regular price £4.29
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Description

Sizes Available

  • 1.0mm – fine micro detail
  • 1.2mm – engraving, bead making, delicate carving
  • 1.5mm – small dimples
  • 1.8mm – precision carving in stone and glass
  • 2.0mm – bead making, engraving, shaping
  • 2.5mm – general carving and forming
  • 3.0mm – shaping small spheres, glass engraving
  • 4.0mm – carving larger ball shapes in stone and glass
  • 5.0mm – shaping curves, depressions and textures
  • 6.0mm – deeper, wider forms

Ideal For

  • Glass engraving
  • Stone carving & lapidary (jade, agate and more)
  • Ceramic and enamel work
  • Fossil preparation
  • Bead making
  • Jewellery modelling & shaping work

How to Use

  • Run at low to medium speed (approximately 8,000–12,000 RPM)
  • Use light pressure – let the diamond do the cutting
  • For glass and stone, use with water for cooling and dust control

Why Choose Eternal Tools

We supply only precision-made diamond tools with consistent coating quality and excellent longevity. No thin patches, no uneven plating – just reliable performance and clean carving.

Customer Reviews

Specifications

Technical Specifications

  • Total Length: 43mm
  • Shank Diameter: 2.35mm (3/32") – suitable for micromotors, pendant motors, Dremel-type tools and rotary handpieces with a 2.35mm collet.
  • Head Shape: Hollow cup / concave forming burr.
  • Diamond Grit:
    • 1.0mm – 3.0mm sizes: 240 grit (fine)
    • 4.0mm – 6.0mm sizes: 150 grit (medium)
  • Diamond Coating: Electroplated diamond grit for clean, controlled cutting on hard materials.
  • Individual Sizes Available: 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm.
  • 6-Piece Set Includes: 1.0mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm.
  • Material Compatibility: Glass, stone (jade, agate, quartz, etc.), ceramics, enamel, shell, bone, and non-ferrous metals.
  • Recommended Speed: 8,000–12,000 RPM. (Use lower speeds for delicate engraving or small diameter burrs.)
  • Cooling: Use with water when working on glass and stone to reduce heat, dust, and wear.

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