Irwin Magnetic IMPACT Bit Holder with a C-ring design that has an internal clip that fits into the retaining ring notch of the screwdriver insert bit to hold it securely in place. Rare earth magnet holds fastener securely. Magnet is four times more powerful than standard magnets. Magnetic bit holder for use in impact drivers, power drills and driver handles Magnetic socket holds most common ¼” hex screwdriver bits securely. Quick bit changes for convenience. Length 75mm 1/4 Inch hex drive Robust shaft C-ring internal clip Powerful Rare earth magnet Maximum performance in Impact drivers