Magnetic Bit Holders are engineered for extreme durability for long life as it made of fully hardened and tampered material to extend bit life. These bit holders ensure precision and accuracy thereby delivering high quality, professional job. It is ideal for other applications such as deck building and framing and more. These magnetic bit holders are consist of a hexagonal steel bar, one end of which grips the chuck. A small magnet is attached to the bit holder which prevents the bit from dropping out.