IRWIN® Bit Holder is suitable for impact screwdriver bits Manufactured with heavy-duty cold-forged high-grade steel to withstand high torque output from impact drivers Stainless steel body with a black oxide finished shank resists corrosion and increases life A rare-earth magnet holds the fastener securely This magnet is four times more powerful than standard magnets The holder has a C-Ring design meaning that it has an external clip that fits into the retaining ring notch of the insert bit to hold the bit securely in place Length 150mm 6in