【S2 High Hardness Alloy Steel Material】 Hardened up to HRC60, stronger than CRV material. Don't worry about wear and tear? after a certain period of use. Screw: Hardness: S2 > CR-V > General steel. 【Multifunction】 The tool kit includes 56 screwdriver bits for servicing various devices, such as iPad, iPhone, tablet, laptop, PC, smartphone, watch, glasses, camera, PS4/Xbox, switches and other electronic devices. te.< /p> 【Flexible Rod】 When the screws to be handled are hidden in corners, at the back or other fronts, the flexible rod can be bent in the desired direction. 【Ergonomic Push Design】 There is a PUSS TO OPEN button near the switch. As long as you press it, a whole row of screw heads will rise up, making it easy for you to grab one. When removed, push down the entire row of screwdriver bits to retract them. 【Portable】 56 bits and 4 tools are packed in a small box. Each type of stacking head has a corresponding card position, and the marking is clear and convenient for loading.