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Busch Burr 77A Pearl Drill 2.10mm – A preferred choice among professional jewelers, this drill bur delivers exceptional precision and quality to prevent chipping and create smooth, soft-edged holes in delicate materials such as pearls. Since 1905, Busch has been a global leader in high-precision rotary tools, renowned for manufacturing durable, high-quality burs designed specifically for accuracy and reliability in fine jewelry making.
These Busch® Burs Pearl Drills feature a distinctive smooth flat head and a 2.10mm diameter, expertly crafted from hardened steel to ensure clean, chip-free holes without damaging the delicate nacre. Each bur offers a 4.2mm working head depth, providing consistent and controlled drilling whether starting new holes or enlarging existing ones. Compatible with various rotary tools—including pendant drills, micromotors, and pin vices—these burs allow jewelers to maintain excellent control and precision.
For best results, pearls should be securely held in a pearl vice or carefully in fingers wrapped with protective tape and drilled under water to minimize overheating and discoloration. Crafted for long-lasting performance, Busch® Burs are an essential addition to any jeweler’s toolkit, delivering smooth finishes and fine detailing with ease.
- Brand: Busch®
- Type: Pearl Drill Bur
- Model: 77A Pearl Drill
- ISO Number: #021
- Shank Diameter: 3/32"
- Size: 2.10mm diameter, 4.2mm working head depth
- Shank: 2.34mm tapered, compatible with various drill collets
- Material: Premium tungsten vanadium hardened steel
- Application: Jewelry making, pearl drilling, delicate material drilling, gemstone drilling
About this Item:
Busch® burs are precision-engineered from premium tungsten vanadium steel, providing exceptional hardness and durability for extended tool life. Their fine, evenly spaced teeth and expertly sharpened cutting edges deliver smooth, chip-free holes in delicate materials such as pearls, soft gemstones, and other fragile jewelry components. The 77A Pearl Drill features a smooth flat head design that minimizes damage to the nacre surface, making it the trusted choice of professional jewelers and craftsmen worldwide.
This bur is engineered for consistent, controlled cutting at low rotary speeds, helping reduce heat buildup and material stress. The 4.2mm working head depth offers the ideal balance between penetration and control when drilling or enlarging pre-existing holes. Compatible with a wide range of rotary tools—including pendant drills, micromotors, flex shafts, and pin vices—this bur provides versatile use for detailed jewelry work and precision pearl drilling.
How to Use:
Secure the bur in your rotary tool or flex shaft. Apply gentle, consistent pressure and maintain steady speed to prevent overheating and chipping. Use a suitable lubricant, such as Busch Lube-Stik, or drill under water to prolong bur life and protect delicate materials. Always stabilize pearls using a pearl vice or by wrapping fingers with protective tape to avoid slippage and ensure accurate drilling.
Safety Information:
Wear appropriate personal protective equipment, including safety glasses or goggles, to protect against flying debris. After use, clean the bur carefully with mild soap and a soft cloth to maintain sharpness and prevent corrosion.
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Features
2.10mm Precision Drill: Designed to create clean, soft-edged holes with minimal risk of chipping or cracking, ideal for pearls, soft gemstones, and other delicate materials.
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Premium Tungsten Vanadium Steel Construction: Crafted from hardened tungsten vanadium steel for superior strength, durability, and extended tool life under repetitive use.
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4.2mm Working Head Depth: Provides optimal control and depth for consistent, precise drilling and enlarging of pre-existing holes without compromising material integrity.
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Smooth Flat Head Design: Minimizes stress on pearl nacre and delicate surfaces, helping prevent surface damage or rough edges during drilling.
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Low-Speed Performance: Optimized for use at low rotary speeds, reducing heat buildup and preserving the quality of sensitive materials.
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Wide Tool Compatibility: Fits various rotary tools including flex shafts, pendant drills, micromotors, and pin vices, offering versatility for professional and hobbyist jewelers alike.
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Lubrication Recommended: Use with lubricants like Busch Lube-Stik or drill under water to extend bur life and enhance cutting smoothness.
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Ergonomic Tapered Shank: The 2.34mm tapered shank ensures secure fit in standard drill collets for enhanced stability and control.
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Professional Grade Quality: Trusted by jewelers globally for consistent accuracy, smooth finishes, and reliable performance in fine jewelry making and repair.
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Pack of 6 Burs: Offers great value with multiple burs per pack to support continuous work or professional workshops.
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