30mm Donut Diamond Bur, 5pcs – 400 Grit Rotary Grinding Tool for Glass, Stone & Ceramic

The 30mm Donut Diamond Bur, 5pcs is a precision rotary tool grinding bit engineered for smooth contouring, edge rounding, concave detailing, and fine surface finishing on glass, stone, ceramic, and gemstones. Featuring a rounded donut profile electroplated with fine 400 grit diamond coating on a rigid 6mm shank, this 5-piece set delivers exceptional control and uniform finishing without chatter.

• Head Diameter: 30mm
• Shape: Donut (Rounded Torus / Doughnut)
• Grit: 400 Grit fine diamond coating
• Shank Diameter: 6mm heavy-duty rotary shank
• Quantity: 5-Pack (5 pieces)
• Bond Type: Electroplated diamond
• Applications: Edge rounding, smoothing, concave detailing, contour carving, and pre-polishing on jade, agate, quartz, glass, porcelain, marble, and granite

Use with water lubrication or liquid coolant during grinding to prevent thermal buildup and maximize tool life.