Diamond Core Bits For Granite

Tired of Burnt Bits and Slow Drilling Speeds in Hard Rock? Gdrills' superior diamond core bits are designed especially for hard rock formations (Class 1 to 7 hardness) and high-density granite. We provide drill bits that cut more quickly, endure longer, and never glaze over-even in the most challenging geologic conditions-by fusing superior synthetic diamond crystals with our exclusive cobalt-alloy metal bond.

Laser-welded segments are 100% safe and won't break under extreme heat.

Custom Bond Formulas: Exactly tailored to the layers of rock hardness you have.

Factory-Direct Supply: OEM/ODM production that is scalable for international distributors.

WL type core bits are specialized diamond core drill bits designed for use in HAGBY wireline core drilling systems. These bits are optimized for efficient core recovery, deep drilling, and high precision in mineral exploration, geotechnical studies, and geological surveys.

WL-Type Core Bits (For HAGBY Wireline System)

Stone Countertop Fabrication – Drilling holes for faucets, sink cutouts, and installations.

Construction & Renovation – Creating anchor holes for structural components in granite.

Tile & Masonry Work – Precise drilling in granite tiles for flooring and wall installations.

Monument & Sculpture Industry – Crafting and modifying granite monuments or artistic stonework.

Mineral Exploration – Extracting geological samples for mining projects.

Geotechnical Investigations – Studying rock formations for construction and infrastructure projects.

Hydrogeological Studies – Drilling for water resource assessments.

Environmental Drilling – Sampling soil and rock layers for contamination studies.

Segment burning (overheating and diamond glazing) is the #1 failure in hard stone drilling. Follow these technical guidelines from our engineers to maximize your tool life:

Ensure Continuous Water Flow (Wet Drilling): Never cut water supply short. Water cools the metal matrix and flushes out highly abrasive granite slurry. Slurry buildup causes friction, leading to immediate segment overheating and loss.

Match RPM with Bit Diameter: Running too fast generates extreme heat, causing the diamond to carbonize. For hard granite, reduce your RPM: For OD 50mm: Recommended 900 - 1200 RPM. For OD 100mm: Recommended 450 - 600 RPM

Avoid Excessive Downward Pressure: Let the diamond segments do the work. Applying too much force compresses the bond, preventing worn diamonds from shedding. This causes the bit to "glaze" (feel smooth and stop cutting).

How to Recover a Glazed Bit (Dressing): If your bit stops cutting and looks polished, run the drill bit through a highly abrasive material (such as an dressing stone, firebrick, or soft sandstone) at a low speed to strip the glazed metal and expose new, sharp diamond grits.

As an ISO-certified diamond tool manufacturer, Gdrills supports international wholesalers and drilling contractors with flexible, high-capacity production:

Custom Formulation: We can adjust the cobalt-to-iron ratio based on core samples or geologic reports from your local market.

Laser Engraving & Branding: Free laser-etching of your logo, part numbers, and safety specs on the steel core.

Flexible Packaging: Custom-branded color boxes, heavy-duty tubes, or bulk crates ready for retail or industrial supply.

Reliable MOQ & Trial Orders: Low-risk test orders to help you verify our quality before committing to bulk containers.

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