Novritsch Tool Kit (S2 Steel)A must have tool kit you will need to work on your airsoft replicas in a compact box. The bits are made of S2 tool steel, which is classified as shock resistant and can be found in other high quality toolsets. In other words, no more broken bits. Includes: Screwdriver with back swivel. Screwdriver extension S2 Steel bits Tweezers Valve tool Magnetic box cover