The Coro Diamond Glass Drill Bit 12mm is a high-precision drilling accessory engineered for materials that demand gentle, controlled cutting rather than aggressive impact. Traditional twist bits or masonry bits are unsuitable for glass and tile, as their impact action and high cutting speeds can cause cracking, chipping, or surface pulverization. Coro’s diamond abrasive technology overcomes these challenges by grinding through the surface gradually and cleanly.

Diamond-Coated Grinding Technology of Coro Diamond Glass Drill Bit 12mm

This drill bit features industrial-grade diamond particles electroplated around the drilling tip. These diamond abrasives act as micro-cutters that grind the material instead of cutting with sharp edges. The 12mm diameter provides a hole size commonly needed for plumbing fixtures, electrical conduits, anchor bolts, shower fittings, and decorative interventions in glass or tile surfaces.

The diamond coating is bonded to a hardened steel shaft that maintains rigidity and straightness during rotation. Because the diamonds are oriented uniformly, each drilling cycle maintains consistent grinding action at the contact surface, reducing the risk of asymmetrical wear or hole deformation.

Precision and Thermal Management

Drilling glass and tile generates heat quickly, which can weaken the diamond bond and reduce bit life. The Coro 12mm bit is designed for low speed, high control drilling, typically using water or a lubricant to cool the bit and flush debris. This cooling not only preserves the integrity of the diamond abrasive but also prevents thermal stress that can lead to cracking in brittle materials.

The smooth, even drilling profile ensures that holes are perpendicular and true, with minimal roughness on both entry and exit points.

Field Performance for Kenyan Construction

Glass, ceramic, and porcelain finishes are widespread in Kenyan residential, commercial, and hospitality projects — especially in kitchens, bathrooms, storefronts, and interior feature walls. This Coro drill bit is suitable for drilling:

• Tempered and annealed glass (subject to manufacturer guidelines)

• Ceramic wall and floor tiles

• Porcelain tiles and stone veneers

• Mirrors and decorative glass panels

Its 12mm size is particularly useful for plumbing lines, towel rails, curtain rods, and electrical raceways in interior fit-outs.

Tool Compatibility and Proper Usage

The Coro Diamond Glass Drill Bit 12mm is compatible with standard variable-speed electric drills and drill presses. It must be used strictly in rotary mode only — hammer function must be disabled to avoid surface damage. A low RPM range allows dust to be removed while minimizing heat buildup.

A recommended drilling method is to start at a slight angle to establish a groove, then gradually bring the bit to a perpendicular position. Continuous water cooling or lubricant during drilling significantly improves cut quality and extends tool life.

Durability and Operational Value

Compared to traditional carbide or steel bits, diamond-coated drill bits exhibit superior wear resistance when used correctly on brittle surfaces. The Coro 12mm bit wears evenly because of its uniform diamond distribution, ensuring consistent performance across multiple drilling tasks. This durability translates to fewer bit changes and reduced consumable costs for contractors and installers.

Compliance and Procurement Assurance

All Coro Diamond Glass Drill Bits supplied by Ngong Hills Merchants are KEBS certified, meeting Kenyan standards for construction accessories and hand tools. Every purchase is supported with a fully eTIMS-compliant invoice, which is mandatory for business expense documentation and tax deduction eligibility in Kenya from 2026 onwards. This ensures procurement compliance and reliable records for audits and contractor accounting.

Specifications & Key Features

Use Cases & Applications of Coro Diamond Glass Drill Bit 12mm

• Drilling holes for plumbing fixtures and sanitary fittings

• Kitchen and bathroom tile installations

• Mounting mirrors and glass shelving

• Electrical conduit entry through tiles or glass surfaces

• Interior decorative glass installations

This drill bit enhances precision and surface protection in brittle material drilling tasks essential to finishing work and interior installations.

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