S2 High Hardness of Alloy Steel Material Hardness up to HRC60, stronger than CRV material. Don't worry about wearing out after a certain period of use. Screw head material hardness: Hardness: S2> CR-V> General Steel.<br>Multi-functionThe tool set includes 56 screwdriver bits for maintenance of various devices such as iPad, iPhone, tablet, laptop, PC, smartphone, watch, glasses, device camera, PS4/Xbox, Switches and other electronic devices.<br>Flexible RodIf the screws you need to handle are hidden in the corners, back or other fronts, the flexible rod can be folded in any direction you want.<br>Ergonomic Push DesignThere is a PUSS TO OPEN button near the switch. As long as you press on it, a whole series of screw heads will rise up so you can easily grab one. Once removed, push the entire row of screwdriver bits to retract them.<br>Portable56 bits and 4 tools are housed in one small box. Each type of stacking head has a corresponding card position, and the marking is clear and convenient for loading.<br>