40mm Donut Diamond Bur, 5pcs – 80 Grit Rotary Grinding Tool for Glass, Stone & Ceramic

The 40mm Donut Diamond Bur, 5pcs is a heavy-duty rotary grinding tool engineered for convex contouring, edge rounding, hollow cavity shaping, and smooth curved finishing on glass, stone, ceramic, and gemstones. Featuring a rounded donut profile electroplated with aggressive 80 grit diamond coating on a rigid 6mm shank, this 5-piece set delivers exceptional durability and stock removal rate without vibrating.

• Head Diameter: 40mm
• Shape: Donut (Rounded Torus / Doughnut)
• Grit: 80 Grit coarse diamond coating
• Shank Diameter: 6mm heavy-duty rotary shank
• Quantity: 5-Pack (5 pieces)
• Bond Type: Electroplated diamond
• Applications: Edge rounding, beveling, concave detailing, contour carving, and shaping 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.