Bit Extension 18"

The Milwaukee 48-28-4011 is a heavy-duty 18-inch drill bit extension designed to increase reach when drilling deep holes through wood framing or other materials. It is commonly used with self-feed bits, auger bits, and hole saws when working in tight spaces or thick structural materials.

This extension is popular among electricians, plumbers, and contractors who need to drill through studs, joists, and beams without using extra-long drill bits.

Key Features

• 18-inch extension length for deeper drilling reach
• 7/16-inch hex shank for high-torque drilling applications
• Accepts all 7/16″ hex shank accessories
• Compatible with self-feed bits, auger bits, and hole saws (1″ diameter and larger)
• Heavy-duty steel construction for jobsite durability

Specifications

• Model: 48-28-4011
• Type: Bit Extension
• Length: 18 in (457 mm)
• Shank Size: 7/16 in Hex
• Material: Hardened steel
• Typical Price: about $20–$30 depending on retailer

Typical Applications

• Drilling deep holes in wood framing
• Electrical and plumbing rough-in work
• Reaching through multiple studs or thick beams
• Working in tight or obstructed areas

✅ Summary:
The Milwaukee 48-28-4011 is a professional-grade 18-inch bit extension that allows contractors to extend the reach of large drill bits for deep drilling applications, improving access and efficiency on construction and installation jobs.