* Those hex head screwdriver bits are made of S2 alloy steel with high hardness and good durability.

* The surface is processed by Vacuum heat treatment, not easy to rust.

* The magnetic is optional. If you need, please let us know. 

* The type of the bit is printed on the surface, easy to choose the one you need, widely used on air screwdrivers, electric drills, etc

* 1/4 Inch Hex Shank Phillips #2 Screwdriver Bit