21/64" THUNDERBOLT® Titanium Drill Bit

Key Features

• Titanium Coating (TiN) – Helps reduce heat buildup and extends bit life up to 3× longer than standard bits
• 135° Split Point Tip – Starts on contact and helps prevent walking for more accurate holes
• Thicker Core (Thunderbolt Web Design) – Adds strength and improves resistance to breakage under side load
• Parabolic Flute Design – Clears chips quickly for faster, cooler drilling
• 3-Flat Secure-Grip Shank – Reduces slipping in the drill chuck

Specifications (typical)

• Size: 3/8 in
• Material: High-speed steel with titanium coating
• Shank: 3-flat secure grip
• Use with: Standard cordless or corded drills
• Materials: Metal, wood, PVC, plastics

Best Uses

• Drilling steel and other metals
• Wood framing and construction
• PVC and plastic fabrication
• General maintenance and jobsite work

Bottom Line

The 48-89-2218 is a single heavy-duty titanium drill bit, not a set. It’s meant for when you specifically need a durable 3/8" bit that resists wear and stays sharp longer, especially in metal drilling.