Milwaukee 48-28-4016 Bit Extension 24" is a 24-inch drill bit extension made to add reach when using large boring accessories. This is a bit extension designed for deep-reach drilling with self-feed bits, auger bits, and hole saws. Model Number: 48-28-4016. If you regularly drill through wall cavities, rafters, subfloors, or other hard-to-reach spots, this accessory solves a simple problem: it lets you keep the drill where you can control it while the bit reaches the work.

The big advantage here is the 24-inch extension length. That extra reach matters when you are boring for rough-in work and cannot get the drill body close to the surface. Electricians, plumbers, HVAC installers, and remodelers run into this all the time in attics, between studs, and across joist bays. Instead of piecing together a workaround, this extension gives you a direct way to reach the cut while keeping better leverage on the tool.

Milwaukee built this extension around a 7/16 inch hex shank format, which is the key detail that determines what it works with. It is intended for self-feed bits, auger bits, and hole saws 1 inch in diameter and larger with a 7/16 inch shank. That means it is aimed at larger-hole drilling, not general-purpose twist bits. If you are boring for pipe, conduit, wire runs, or pass-throughs where bigger holes are standard, this is the right type of accessory.

On the drive side, the 7/16 inch hex fits both standard 3-jaw chucks on drills with 1/2 inch capacity and larger, and 7/16 inch quick-change chucks. That gives it useful flexibility on the job because you are not locked into a single drill style. If you already run larger right-angle drills or heavy-duty drill products, this extension fits into that workflow without much fuss.

The bit is secured with a hex key, and Milwaukee includes that detail in the product description for a reason. When you are driving bigger self-feed or auger accessories, a secure connection matters. Large-diameter boring puts more load on the setup than light drilling does, so a locked-in accessory helps the extension stay planted and reduces the chance of the bit shifting when you start the hole.

At 1.55 pounds, this is not a throwaway accessory, but that weight is part of the tradeoff for a long, heavy-duty extension meant for larger boring accessories. It is a single-piece, non-kit accessory, so the point here is straightforward function rather than extra attachments or packaging. You keep it in the truck or gang box for the jobs where standard reach is not enough.

If you are buying based on application, the Milwaukee 48-28-4016 Bit Extension 24" makes the most sense for trade users who drill larger holes in framing and concealed spaces. It is especially useful for rough-in work where access is tight and you need to extend a self-feed bit, auger bit, or hole saw farther into the work area. If your drilling is mostly small-diameter fastening or finish work, this is overkill. If your work involves boring big holes where reach is the problem, this is exactly the kind of accessory that earns its spot fast.

Milwaukee 48-28-4016 Bit Extension 24" Is a Niche Tool That Pays Off Fast

If you drill large holes in awkward places more than once in a while, this is the kind of accessory that goes from occasional helper to permanent truck resident.

• Who it's for: Electricians, plumbers, HVAC techs, and remodelers boring with self-feed bits, auger bits, or large hole saws in framing and concealed spaces.
• Why it stands out: The 24 inch reach and 7/16 inch hex format make it useful with the larger boring accessories that actually need an extension, not light-duty stuff that can get by without one.
• Worth knowing: This is a single-purpose accessory for 7/16 inch shank setups, so make sure your bits and drill interface match before you buy.

• What type of accessories does this extension fit? It accepts 7/16 inch hex shank accessories, including self-feed bits, auger bits, and hole saws 1 inch diameter and larger with a 7/16 inch shank.
• Will it fit a standard drill chuck? Yes, the 7/16 inch hex fits 3-jaw chucks on drills with 1/2 inch capacity and larger.
• Can it be used with quick-change systems? Yes, it also fits 7/16 inch quick-change chucks.
• Is this a kit or a single accessory? It is a non-kit, single-piece accessory.