Weha Blitz Dry Diamond Core Bit — Vacuum-Brazed Interior & Exterior Diamond | 1-3/8" & 2" | Granite, Quartz & Stone

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The high-speed dry core bit engineered for aggressive, clean drilling on stone countertops. The Weha Blitz Dry Diamond Core Bit is purpose-built for granite, marble, quartz, quartz ite, engineered stone, and concrete countertop fabrication. Vacuum-brazed diamonds on both the inside and outside of the barrel minimize drag, heat, and friction while delivering immediate bite, reduced walking, and fast, clean holes. Specifications Available sizes: 1-3/8", 2" Thread: 5/8"-11 Total length: 4" Recommended speed: Up to 10,000 RPM Use: Dry (primary) | Wet (optional) Expected life: Approximately 60–150 holes depending on material thickness and hardness What Makes the Blitz Different Interior & Exterior Vacuum-Brazed Diamonds Unlike standard core bits that only feature exterior diamonds, the Blitz is vacuum-brazed inside and outside the barrel. This dual-diamond design increases cutting speed, improves core release, and allows for easy hole enlargement when needed. Also performs exceptionally well for radius holes and fine-tuning grommet openings. Fast Drilling Performance Capable of drilling through 3cm granite in seconds at recommended speeds. Operates at up to 10,000 RPM for maximum throughput in production fabrication environments. Dry or Wet Use Designed primarily for dry on-site fabrication — mount directly onto standard 5/8"-11 grinders for fast faucet holes, sink corners, radius work, and grommet openings. May also be used wet in shop environments with air or electric polishers. 60–150 Holes Per Bit Despite its high cutting speed, the Blitz delivers impressive durability. Approximately 60–150 holes per bit depending on material thickness and hardness. Compatible Materials Granite and marble Quartz and engineered stone Quartzite and natural stone Concrete countertops Key Features Dual vacuum-brazed diamonds — inside and outside barrel; faster cutting, better core release, easy hole enlargement Immediate bite — reduced walking from first contact; improved control and accuracy 10,000 RPM rated — high-speed performance for production fabrication 5/8"-11 thread — fits standard angle grinders and polishers Dry or wet use — flexible for jobsite and shop environments 60–150 hole life — durable performance despite aggressive cutting speed Works Well With Weha Dry Magic Hex Head Core Bits — alternative dry core bit with hex head for drill driver use Weha Dry Magic Vacuum Brazed Core Bits — vacuum-brazed alternative in additional size options Weha T-31 Anchor Bit — for drilling anchor holes in stone after core drilling is complete Weha 5" Matrix Diamond Turbo Contour Blade — for vanity bowl cutouts on the same granite and quartz materials Weha Rock Dog Router — for edge profiling after sink and faucet hole drilling is complete Show more