Overview: 1. The hardness of the chrome vanadium alloy screwdriver bit is 55-60 HRC. 2 The screwdriver bit is magnetic and is made of sturdy impact-resistant tool steel such as chrome vanadium steel. The screws can be tightened during maintenance, which improves performance and saves time and effort. 3. Very suitable for repairing laptops, mobile devices and other delicate items such as watches and glasses. Light weight and compact design 4. The additional flexible shaft extension rod can be adjusted up to 60 mm in length, and provides a soft flexible shaft, allowing you to obtain completely inaccessible screws, which is very suitable for three-dimensional work. 5. The perfect repair tool for iPad, iPhone, Tablets, Laptops, PCs, Smartphones, Watches, Glasses, PS4 / Xbox Camera Controller and other electronic devices. Product Information: Model: 117+Double-sided magnetic pad Set type: Multi-functional combination set Number of pieces included: 118 Whether it is magnetic: Yes Material: CRV System: Metric Scope of application: non-precision maintenance Color: black box, red box, blue box