IDEAL Industries 78-0108-10 Magnetic Bit Holder 6", 10/clam

It has a 1/4 inch hex body, so it drops into any standard 1/4 inch hex chuck or bit drive. IDEAL states it fits all standard multi-bit screwdrivers and power drills, so the same holder moves between a drill driver and a hand screwdriver handle on the same job.

Two things hold the bit. The shank carries a magnet strong enough to grab and hold the bit, and power bits with a power locking groove lock into the holder rather than just sticking to it. That matters pulling devices in a ceiling box or working off a ladder where a dropped bit costs you the trip down.

The 6 inch length is an extension. It gets the chuck body back out of the way so you can drive screws down inside a deep box, through a stud bay, or into a recessed device opening where the drill head would otherwise bottom out before the bit seats. The extension is slender for that reason. If you have clear access to the screw head, a bit in the chuck is fine; the holder earns its keep on the awkward ones.

No. It is the holder only, 10 of them in a clamshell. You supply the 1/4 inch hex insert bits, and power bits with a locking groove will lock in rather than relying on the magnet alone.

IDEAL heat treats this holder and machines it to tight tolerances so the hex pocket holds bit dimension instead of rounding. Loose tolerance is what makes a bit wobble off axis and cam out of the screw head, so the fit spec is the part that matters on a production day, not the magnet.