The Piranha PAVBDB HEX 1/4" coring bit is a vacuum-brazed diamond core bit built for clean, accurate holes in porcelain, marble, and stone. Its hexagonal shaft chucks directly into a standard drill, so you don't need a grinder or threaded adapter to get started. The combination of vacuum-brazing and synthetic diamond helps the bit regulate heat for consistent cutting quality and a durable diamond-to-bit bond. Suitable for both wet and dry use, though at this small 1/4" (6 mm) diameter Piranha recommends running a water feed to extend the bit's life.

Key features

• 1/4" diameter diamond coring bit, part of the Piranha PAVBDB HEX series (3/16" to 5" / 5 mm to 130 mm range)
• Hexagonal shaft seats directly in a standard drill chuck — no grinder or adapter required
• Vacuum-brazed construction with synthetic diamond for a strong diamond-to-bit bond and consistent heat regulation
• Designed for both wet and dry coring of porcelain, marble, and stone
• Water feed recommended at this size (under 12 mm) to maximize bit lifespan
• Let the bit cut on its own — avoid excess pressure for best performance and longevity

Specifications

• Brand: Piranha
• Series: PAVBDB HEX
• Supplier SKU: PAVBDB80-6
• Diameter: 1/4" (approx. 6 mm)
• Shaft: Hexagonal (fits standard drills)
• Construction: Vacuum-brazed synthetic diamond
• Use: Wet and dry (water feed recommended)
• Materials: Porcelain, marble, stone