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Busch Burr 77A Pearl Drill 2.70mm – a top choice for professional jewelers, this precision tool delivers exceptional quality to prevent chipping and create smooth, clean holes in delicate materials such as pearls, coral, ivory, and other organic gemstones. Since its founding in 1905, Busch has been a world leader in high-precision rotary tools, renowned for manufacturing durable, high-quality burs that provide unmatched precision and reliability in fine jewelry making.
These Busch® Burs Pearl Drills feature a unique smooth flat head with a 2.70mm diameter, meticulously crafted from strong, hardened steel to ensure clean, soft-edged holes without damaging the nacre or surface integrity. Each bur has a 4.2mm working head depth, designed for consistent and repeatable results, whether drilling new holes or enlarging pre-existing ones.
The burs are compatible with a variety of rotary tools, including pendant drills, micromotors, pin vices, and flexible shafts, allowing jewelers to maintain optimal control and precision across different applications. The tapered 2.34mm shank fits securely in most professional collets, ensuring stability and accuracy during use.
Usage Recommendations:
For optimal results and to protect the delicate structure and luster of pearls, it is best to hold the pearl securely in a pearl vice or grip it gently with fingers wrapped in protective tape. Drilling should be performed under water or with a coolant to prevent overheating, discoloration, and stress fractures in the pearl or organic material. Using light pressure and maintaining a steady drilling speed will also extend the life of the bur and improve finish quality.
Durability and Performance:
Crafted from premium hardened steel, Busch® burs are engineered for long-lasting performance, retaining sharpness and cutting efficiency through multiple uses. Their design minimizes vibration and heat generation, ensuring smooth finishes and fine detailing with ease. This makes them an essential and reliable tool for any jeweler’s toolkit, whether for custom pearl jewelry, repair, or detailed craftsmanship.
Brand: Busch®
Type: Pearl Drill Bur
Model: 77A Pearl Drill
ISO Number: #027
Shank Diameter: 3/32" (2.34mm tapered)
Size: 2.70mm 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 meticulously crafted from premium tungsten vanadium steel, designed to deliver smooth, precise, and consistent cuts for flawless finishing. Their finely milled teeth and precision-ground edges make them ideal for jewelry detailing, delicate pearl drilling, and repair work. Engineered to perform reliably at low rotational speeds, these burs minimize heat buildup and reduce the risk of damage to fragile materials like pearls and other organic gemstones.
How to Use:
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Secure the bur firmly into a rotary tool such as a flex shaft, pendant drill, micromotor, or Dremel.
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Hold the pearl or delicate item securely in a pearl vise or protect your fingers by wrapping them in soft tape.
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Drill under water or use a coolant to prevent overheating and discoloration.
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Apply gentle, steady pressure and allow the bur to cut smoothly—avoid excessive force or high speeds to maintain tool longevity.
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Use a lubricant like Busch Lube-Stik or light mineral oil to extend bur life and improve cutting performance.
Safety Information:
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Always wear protective eyewear to guard against flying debris.
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Use burs only at recommended speeds to avoid breakage and injury.
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After use, clean burs with a soft cloth and mild soap or ultrasonic cleaner to remove residue and maintain sharpness.
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Store burs in a dry, organized container to protect cutting edges.
Additional Features:
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Tapered 2.34mm shank for secure and stable fit in most professional rotary tool collets.
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Designed for minimal vibration and smooth operation, enhancing precision and comfort during prolonged use.
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Ideal for drilling small, clean holes in pearls, coral, ivory, and other delicate organic materials without compromising their structural integrity.
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Manufactured in Germany with exacting standards to ensure durability, sharpness, and consistent performance.
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Features
2.70mm Precision Drill: Prevents chipping and produces clean, soft-edged holes in pearls, coral, ivory, and other delicate materials for flawless jewelry craftsmanship.
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High-Quality Hardened Tungsten Vanadium Steel: Offers superior durability, excellent sharpness retention, and resistance to wear for long-lasting performance.
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4.2mm Working Head Depth: Provides precise control over drilling depth, ensuring consistent and accurate hole size whether drilling new holes or enlarging existing ones.
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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, allowing flexible use in various jewelry-making setups.
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Professional Grade Quality: Preferred by jewelers and artisans worldwide for its precision, reliability, and smooth cutting action in delicate and intricate applications.
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Low Vibration Design: Engineered to minimize vibration for improved user comfort and enhanced control during detailed work.
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Smooth Flat-Head Cutting Surface: Reduces stress on fragile materials, minimizing the risk of cracking, chipping, or damaging pearls and organic gemstones.
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Optimized for Low-Speed Drilling: Designed to perform best at low RPMs, reducing heat buildup and discoloration risks when working with heat-sensitive materials.
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Easy Maintenance: Smooth surfaces and premium materials make cleaning and upkeep simple, helping maintain peak performance and longevity.
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Precision Tapered Shank (2.34mm): Fits securely in most standard rotary tool collets for stable and consistent operation.
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Ideal for Fine Jewelry Work: Perfect for drilling delicate holes in pearls, coral, ivory, and other fragile materials without compromising their natural beauty or structural integrity.
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