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Busch Burr 77A Pearl Drill 2.50mm – a top choice for professional jewelers, delivers unmatched precision and reliability, engineered specifically to prevent chipping and cracking while creating smooth, clean holes in delicate materials such as pearls, shell, and other organic gems.
Established in 1905, Busch is a world-renowned German manufacturer of high-precision rotary tools, celebrated globally for its durable, efficient, and artisan-grade burs tailored for the fine demands of jewelry making and stone setting. Trusted by master craftsmen and industry professionals, Busch® burs uphold a legacy of engineering excellence.
These Busch® 77A Pearl Drill Burs feature a unique flat-cutting head with a 2.50mm diameter, precisely crafted from hardened, high-carbon tool steel. This design enables jewelers to drill soft-edged, burr-free holes without damaging the nacre (the delicate outer layer of a pearl), reducing the risk of splintering or uneven finishes. The 4.2mm working head depth supports consistent, controlled drilling — whether you're starting new holes or enlarging pre-drilled openings for stringing or post mounting.
Compatible with a wide range of rotary tools, these burs can be used with:
- Pendant drills
- Micromotor handpieces
- Pin vices
- Flexible shaft tools
The standard 2.35mm shank diameter ensures a secure fit in most professional-grade handpieces, offering superior control and balance during high-precision work.
- Brand: Busch®
- Type: Pearl Drill Bur
- Model: 77A Pearl Drill
- ISO Number: #025
- Shank Diameter: 3/32" (2.34mm tapered)
- Size: 2.50mm diameter, 4.2mm working head depth
- Shank: 2.34mm tapered, compatible with various drill collets
- Material: High-quality hardened tungsten vanadium steel
- Application: Jewelry making, pearl drilling, delicate material drilling
About this Item:
Busch® burs are expertly crafted from premium tungsten vanadium steel, designed to provide smooth, precise, and consistent cuts while delivering a flawless finish. Their fine, sharp teeth and precision cutting edges make them especially suited for jewelry detailing, delicate pearl drilling, and intricate repair work. Engineered for optimal performance at low speeds, these burs minimize heat generation and prevent material damage, ensuring the integrity of fragile gems like pearls and other organic stones.
How to Use:
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Secure the bur firmly in a rotary tool such as a flex shaft, pendant drill, micromotor, or Dremel.
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Hold the pearl or delicate material securely, preferably in a pearl vise or with fingers wrapped in protective tape to avoid slippage and damage.
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Drill under water or use a coolant to prevent overheating, which can cause discoloration or cracking.
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Apply gentle, steady pressure and allow the bur to do the work—avoid forcing or high-speed operation.
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Use a lubricant, such as Busch Lube-Stik or light oil, to extend the bur’s life and maintain smooth cutting action.
Safety Information:
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Always wear protective eyewear and follow appropriate safety protocols when operating rotary tools.
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Use the bur only at recommended speeds to avoid breakage or injury.
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After each use, clean the bur with a soft cloth and mild soap or an ultrasonic cleaner to remove debris and preserve sharpness.
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Store burs in a dry, organized container to protect cutting edges from damage.
Additional Features:
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Tapered 2.34mm shank ensures compatibility with a wide range of professional jewelry drills and collets.
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Designed for minimal vibration and smooth operation, improving precision and user comfort during extended use.
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Ideal for drilling small, clean holes in pearls, coral, ivory, and other delicate organic materials without compromising structural integrity.
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Manufactured in Germany to the highest standards of quality and durability, reflecting Busch’s century-long reputation for excellence.
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Features
2.50mm Precision Drill: Prevents chipping and produces clean, soft-edged holes in pearls, coral, ivory, and other delicate materials for flawless craftsmanship.
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High-Quality Hardened Steel Construction: Made from premium tungsten vanadium steel, offering exceptional durability, sharpness retention, and resistance to wear for long-lasting use.
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4.2mm Working Head Depth: Provides controlled, consistent drilling depth for precision hole creation and enlargement without damaging the material.
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Versatile Compatibility: Compatible with a wide range of rotary tools including pendant drills, micromotors, pin vices, flex shafts, and Dremel-style handpieces, ensuring flexibility in your workflow.
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Professional Grade Quality: Trusted by jewelers and craftsmen worldwide for accuracy, reliability, and smooth cutting performance in delicate and intricate applications.
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Low Vibration Operation: Engineered to reduce tool vibration, improving user comfort and allowing precise control even during extended use.
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Flat-Head Design: Unique flat cutting surface minimizes stress on fragile materials, reducing the risk of cracking or splitting pearls and similar organic gems.
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Optimal for Low-Speed Drilling: Designed for use at lower RPMs to prevent overheating and discoloration, especially important when working with heat-sensitive materials like pearls.
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Easy to Clean and Maintain: Smooth design and premium materials facilitate easy cleaning and maintenance, helping maintain peak performance and hygiene.
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Precision Tapered Shank (2.34mm): Fits securely in most standard drill collets for stability and consistent performance during intricate drilling tasks.
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