Thunderbolt 21/64 In Black Oxide Drill Bit – Durable Jobber Length

Experience Milwaukee Thunderbolt 21/64 in. Black Oxide Drill Bit, engineered for demanding work and lasting reliability. The remarkable Thunderbolt web design thickens the core to resist side-load breakage, while parabolic flutes move chips away quickly and keep the bit cooler under load. A 135-degree split-point delivers a precise, walking-free start, enabling fast, accurate holes through metal, wood, and PVC.

Designed to boost productivity: Built for professional jobs and home projects alike, this drill bit minimizes effort and delivers clean starts, suitable for pros and DIYers alike. Its rugged construction and balanced geometry reduce wandering and friction, helping you complete tasks faster with less strain.

• 21/64 in diameter and 4-5/8 in overall length give precise hole sizing and extended reach for this drill bit across metal, wood, and PVC.
• Black oxide finish enhances wear resistance and longevity, delivering a durable drill bit for tough materials.
• 3-flat shank design ensures a secure grip and efficient torque transfer in portable drills.
• 135-degree split-point starts precisely and minimizes walking, making this drill bit reliable for clean holes.
• Parabolic flute geometry clears chips efficiently and maintains cooler operation, enabling a drilling depth up to 3-5/16 in with this drill bit.

Why choose the Milwaukee Thunderbolt: Built to stand up to daily use, this black oxide drill bit combines toughness with precise performance. Its reinforced core and optimized flute flow deliver dependable starts and steady drilling through metal, wood, or PVC. Add it to your toolkit for quicker projects and professional-grade results.