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

Professional-grade 12mm Bullet Head Diamond Burs (3mm Shank, 10-Piece Set) engineered for contouring, concave hollow carving, grooving, and edge radiusing 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: Bullet Head (Cylindrical with Domed / Pointed Bullet Nose)
• Shank Diameter: 3 mm (Standard rotary tool, Dremel, and micro-motor fit)
• Grit: 45# Extra Coarse (Fast material removal and deep cavity carving)
• Bond Type: Electroplated Diamond
• Quantity: 10 pieces per set

Recommended Applications

• Gemstone roughing, lapidary pre-forming, and jade/agate fine carving
• Glass edging, decorative grooving, 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.