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The Busch® Burr 77A Pearl Drill 1.20 mm (ISO #012) is a premium tool designed specifically for professional jewelers who require precision, control, and safety when working with delicate materials like pearls. Busch, established in 1905, has long been recognized as a world leader in high-precision rotary tools, crafting burs that balance durability with ultra-fine accuracy.
These pearl drills feature a smooth flat head design measuring 1.20 mm in diameter, made from high-quality hardened steel to reliably produce clean, soft-edged holes without risking damage to the delicate nacre. The working head depth of 4.2 mm ensures consistent results whether creating new holes or enlarging existing ones.
Compatibility is wide—these burs can be used with pendant drills, micromotors, flex shafts, or pin vices, giving jewelers full control over technique and speed. To prevent chipping and overheating, pearls should be securely held in a pearl vice or gently between fingers wrapped in protective tape, and drilling should ideally be performed under water or a damp environment.
Finished with the reliability and precision that define Busch tools, these burs are essential for any craftsman’s bench, delivering smooth finishes, detailed results, and long-term performance.
- Brand: Busch®
- Type: Pearl Drill Bur
- Model: 77A Pearl Drill
- ISO Number: #012
- Size: 1.20 mm diameter, approx. 4.5 mm working head depth
- Shank: 2.34 mm tapered (3/32”), compatible with standard rotary tool collets
- Material: High-quality hardened tungsten vanadium steel
- Application: Jewelry making, pearl drilling, bead drilling, delicate material reaming
About this Item:
Busch® 77A Pearl Drill Burs are precision-made tools designed specifically for drilling into delicate materials such as pearls, beads, coral, and soft stones. Manufactured in Germany from premium tungsten vanadium steel, these burs offer long-lasting cutting edges, minimal vibration, and a highly polished finish for reduced friction and wear.
Their precision-twisted flute geometry is ideal for soft-edged, clean hole drilling, helping avoid chipping or cracking — especially in organic materials like nacre. The ISO #012 bur measures 1.20 mm in diameter and features a 2.34 mm shank compatible with most jewelry micromotors, flex shafts, and Dremel tools.
Each pack contains 6 burs, making it easy to keep spares or replace dull tools
How to Use:
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Install the Bur: Insert the bur into a rotary handpiece with a 3/32" (2.34 mm) collet — such as a Dremel, flex shaft, or micromotor.
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Lubrication: Apply a small amount of lubricant like Busch Lube-Stik or drilling under water to extend tool life and protect the material.
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Drill Carefully: Use light, steady pressure. Let the bur do the cutting — avoid forcing it. Keep speeds moderate (approx. 1,400 – 10,000 RPM).
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Clear Debris: Occasionally back out the bur to clear chips and prevent overheating or clogging.
Safety Information:
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Always wear protective eyewear when operating rotary tools.
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Never force the bur into the material — use light pressure and moderate speeds.
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Clean after use with a soft cloth or brush and mild soap. Avoid harsh chemicals.
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Store burs in a clean, dry environment to prevent corrosion and maintain sharpness.
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Features
1.20 mm Precision Drill Diameter
Designed specifically to prevent chipping and produce clean, soft-edged holes in pearls, coral, shell, and other delicate materials.
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High-Quality Hardened Tungsten Vanadium Steel
Crafted for exceptional durability and long-lasting sharpness, ensuring consistent performance even at low operating speeds.
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4.2 mm Working Head Depth
Provides a controlled and consistent drilling depth to minimize the risk of cracking or damaging delicate beads and pearls.
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Optimized Twist Flute Geometry
Engineered for smooth, even cutting with minimal vibration and heat generation, reducing material stress during drilling.
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Versatile Compatibility
Fits standard 3/32” (2.34 mm) tapered shanks, compatible with pendant drills, micromotors, flex shafts, Dremels, and pin vices.
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Professional Grade Quality
Trusted worldwide by jewelers, artisans, and precision craftsmen for its accuracy, reliability, and finish quality.
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Pack of 6 Burs
Ideal for repeated use or replacement, ensuring uninterrupted workflow in jewelry repair or creation.
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Suitable for Full Drilling and Reaming
Can be used to drill new holes or gently enlarge existing ones without compromising the material integrity.
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Recommended Operating Speeds
Best performance achieved between 1,400 and 10,000 RPM depending on the material being worked on.
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Lubrication and Cooling Friendly
Compatible with lubricants like Busch Lube-Stik or water cooling methods to extend tool life and protect sensitive materials.
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Made in Germany
Manufactured under strict quality control standards to ensure precision and durability.
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