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)