This screwdriver bit holder is impact rated and has a slender "torsion" design which is intended to flex instead of breaking when subjected to heavy duty load conditions. The quick change locking chuck secures screwdriver bits in place and prevents them from being pulled out during use. There is also a magnet inside the bit holder. The 1/4" hex shank can be used in all standard impact drivers as well as the majority of drills, drill drivers and screwdrivers. Features and Benefits • Impact rated: suitable for use in impact drivers • Torsion design for durability • Magnetic, locking quick change chuck • Works with a wide variety of tools and all standard screwdriver bits Specifications • Length: 65mm • Shank: 1/4" Hex