This 1/4" Phillips screwdriver bit socket is made from high strength chrome-vanadium steel with good wear resistance. This type of highly strength bits are excellent to increase the rotation power. It can be quickly adjusted, changed and released. It can also be used for do-it-yourself home projects, carpentry, mechanical maintenance, etc. Suitable for electric drill, air drill and other tools. Available in Phillips 0, Phillips 1, Phillips 2 and Phillips 3.