Made of special tool steel and heat and chemically treated. Coated with black oxide, so as not to damage the head of the mounting screws and the screwdriver tip itself. Ideal for disassembling and assembling screws of electronic components. Practical in use, due to the rotating element at the end of the screwdriver. Element which does not allow you to lose concentration by screwing and enables mounting with a single grip. Standard S and PH. Universal in use and practical in storage