Bosch #20 Jobber Drill Bit BL4020 - 3 1/4 in Overall Length Pack of 12

🔧 Product Specifications

• 🏭 Brand: Bosch Professional Grade
• 📦 Model: BL4020 Jobber Drill Bit
• 📏 Size: #20 Wire Gauge
• 📐 Overall Length: 3-1/4 inches
• 🔩 Bit Type: Jobber Length Twist Drill
• 💪 Material: High-Speed Steel (HSS)
• 🎯 Application: Steel, Cast Iron, General-Purpose Drilling
• 📦 Quantity: Pack of 12 Bits
• ✨ Condition: Brand New
• 🏗️ Best For: Metalworking, Construction, Maintenance

❓ Frequently Asked Questions

Q: What is a #20 jobber drill bit used for?
A: The #20 size (0.161" diameter) is ideal for precision drilling in steel, cast iron, aluminum, and general-purpose materials. It's commonly used for creating pilot holes, drilling mounting holes, and metalworking applications where exact hole sizing is critical for tapping, fastening, and assembly work.

Q: What does "jobber length" mean?
A: Jobber length is the most common drill bit length, offering an optimal balance between reach and rigidity. At 3-1/4" overall length, these bits provide sufficient depth for most drilling applications while maintaining the strength and stability needed for accurate, chatter-free holes in metal.

Q: What materials can these Bosch drill bits cut through?
A: These high-speed steel (HSS) jobber bits are engineered for drilling steel, stainless steel, cast iron, aluminum, brass, copper, and other metals. They also work well in wood, plastic, and composite materials, making them versatile for multi-material projects and general shop use.

Q: Why buy a 12-pack instead of individual bits?
A: The 12-pack provides exceptional value for professionals and serious DIYers. Having multiple bits ensures you always have sharp replacements on hand, reduces downtime from broken or dulled bits, and offers cost savings compared to purchasing individually—perfect for production work or maintaining shop inventory.

Q: Are Bosch drill bits better than generic brands?
A: Yes! Bosch professional-grade bits feature precision manufacturing, superior heat treatment, and consistent quality control. They maintain sharp cutting edges longer, drill straighter holes with less walking, and resist breakage better than generic alternatives—delivering professional results and better value through extended tool life.

Q: Can these bits be resharpened when they get dull?
A: Absolutely! High-speed steel jobber bits can be resharpened using a drill bit sharpener or grinding wheel. Proper sharpening restores cutting performance and extends bit life significantly. However, with 12 bits in this pack, you'll have plenty of sharp bits available for demanding projects.

🔨 About These Drill Bits

Bosch BL4020 #20 Jobber Drill Bits deliver precision drilling performance for metalworking, construction, and maintenance applications. Engineered with high-speed steel construction and Bosch's proven manufacturing standards, these bits provide consistent hole accuracy and extended tool life. The #20 wire gauge size (0.161" diameter) is perfect for creating precise pilot holes, drilling mounting points, and general-purpose metalworking tasks.

The 3-1/4" jobber length offers optimal balance between reach and rigidity, ensuring straight, accurate holes without excessive flexing or chatter. Bosch's precision grinding creates sharp cutting edges that penetrate steel, cast iron, and aluminum with minimal effort while maintaining dimensional accuracy. The robust HSS construction withstands the heat and stress of metal drilling, delivering reliable performance across thousands of holes.

This 12-pack provides exceptional value for professionals and serious DIYers who demand consistent quality and performance. Keep your shop stocked with sharp bits for uninterrupted productivity, or use them for production work where bit wear is inevitable. Perfect for machine shops, fabrication facilities, construction sites, automotive repair, HVAC installation, and general maintenance applications.

Whether you're drilling mounting holes in steel brackets, creating pilot holes for tapping threads, or performing general metalworking tasks, these Bosch jobber bits deliver the precision and durability professionals expect. The brand new condition ensures optimal cutting performance right out of the package.

✅ Brand new Bosch professional-grade quality

✅ Pack of 12 for extended use and value

✅ Precision-ground for accurate, clean holes

SKU: NEW LOT 2154 | UPC: 10000346329138