Milwaukee Tool Flat Boring Bit

These Milwaukee flat boring bits use a 1/4 inch quick-change hex shank, so they drop into any universal Quik-Lok style holder or hex extension, and they also grip fine in a standard three-jaw keyless chuck or an impact driver's 1/4 inch hex collet.

For boring a single 2x4 or 2x6 stud, the 6 inch bit is enough. Pick the 16 inch version when you need to reach through doubled plates, drill at an angle inside a bay, or get past an obstruction, since the longer bit gives that reach without adding a set screw extension. The 16 inch length is offered in 3/4 and 7/8 inch diameters only.

Electricians most often bore 3/4 inch for one or two runs of 12/2 or 14/2 NM cable and step up to 7/8 inch when more cables share the hole. Both diameters are stocked in 6 inch and 16 inch lengths. The 1/2 inch, offered in the 6 inch length, is better suited to single small cables or low-voltage wire.

Five sizes, in two lengths. The 6 inch bits come in 1/2 inch (48-27-0501), 3/4 inch (48-27-0751) and 7/8 inch (48-27-0871). The longer 16 inch bits come in 3/4 inch (48-27-0185) and 7/8 inch (48-27-0190). The 1/2 inch diameter is only offered in the 6 inch length.

Yes. The 1/4 inch quick-change hex shank is made to run in all universal Quik-Lok style extensions, so you can stack length on for deep or awkward holes. If the reach problem is modest, the 16 inch bit handles it on its own without any extension.

The Milwaukee spade-style boring bit has double wing spurs that score the hole perimeter for a fast, clean cut, and a patented sharp cutting edge that clears chips and cuts vibration. Spade bits are the right call for fast rough-in holes in framing lumber. Choose a self-feeding auger instead when you are boring many deep holes in a row or working in dense old-growth timber where chip ejection from the full depth matters more than speed.

Each size is ordered on its own, by diameter and length: for example 48-27-0751 is the 3/4 inch by 6 inch and 48-27-0190 is the 7/8 inch by 16 inch. If you want both diameters and both lengths for rough-in work, order them as separate line items.