12mm Egg Shape Diamond Bur, 10pcs – 45 Grit 3mm Shank Precision Carving Tool for Gemstone, Stone & Glass

Professional-grade 12mm Egg Shape Diamond Burs (3mm Shank, 10-Piece Set) engineered for contouring, concave hollow carving, rounded hollows, and smooth transitioning on ultra-hard materials. Coated with premium coarse 45-grit industrial diamond particles via high-adhesion electroplating on a rigid heat-treated steel mandrel.

Key Specifications

• Head Diameter: 12 mm
• Head Shape: Egg Shape (Oval / Ovoid Contouring Profile)
• Shank Diameter: 3 mm (Standard rotary tool, Dremel, and micro-motor fit)
• Grit: 45# Extra Coarse (Fast material removal and deep carving)
• Bond Type: Electroplated Diamond
• Quantity: 10 pieces per set

Recommended Applications

• Gemstone roughing, lapidary pre-forming, and jade/agate carving
• Glass edging, bottle neck carving, and beveling
• Ceramic tile contouring, porcelain relief engraving, and stone masonry
• Hardened steels, carbides, and cast iron surface deburring

Usage Guidelines

• Always operate with water coolant or continuous liquid lubricant to prevent diamond matrix overheating and maintain optimal cutting speed.
• Maintain working speeds between 10,000 and 25,000 RPM using moderate, uniform contact pressure.