Milwaukee 48-89-2721 Black Oxide Jobber Drill Bit 6 in

Product Description

The MILWAUKEE 48-89-2721 is a black oxide jobber length drill bit built for demanding job site use across metal, wood, and general-purpose materials. The Thunderbolt design uses a thicker web core than a standard bit, which resists side-load breakage and extends service life. A 135-degree split point tip starts on contact without walking, so holes are fast and accurate from the first turn. The parabolic flute geometry clears chips and debris quickly, reducing heat buildup. The black oxide coating adds lubricity and corrosion resistance. At 6 inches in length, this bit is suited for deeper hole applications where standard-length bits fall short. Licensed electricians, plumbers, HVAC techs, and general contractors reach for this bit on rough-in and retrofit work alike.

This drill bit fits standard drill chucks and is sized for use in 3/8-inch chucks via its reduced shank diameter. The 3-flat Secure-Grip shank prevents slipping in the chuck during high-torque drilling. It is well suited for curved surface drilling where bit walking is a common problem, and it performs with both corded and cordless portable drills. Typical applications include drilling through framing, conduit supports, sheet metal, and similar materials encountered in trade work.

Key Features

• 135-degree split point tip starts on contact and prevents walking for accurate hole placement
• Thicker web core provides greater strength and resists side-load breakage
• Parabolic flute clears chips fast to reduce heat and extend bit life
• 3-flat Secure-Grip shank prevents slipping in the chuck
• Reduced shank diameter fits 3/8-inch chucks
• Black oxide coating adds lubricity and resists corrosion

Compatibility

Designed for use with standard 3/8-inch and larger keyed or keyless drill chucks on corded and cordless portable drills.

Installation Notes

This bit is installed and removed by a licensed tradesperson using a standard drill chuck key or keyless chuck. Ensure the drill is powered off and the battery removed before changing bits. Secure the 3-flat shank firmly in the chuck before operation to prevent slipping. Follow applicable safety guidelines for drilling near energized components, pressurized lines, or structural members.