Material Alloy Steel Torx style head About this item High Quality: High precision screwdriver head, a high-end steel(chrome vanadium steel 6150#) by special heat treatment, hardness can reach HRC52-60. Size: Package included 25 in 1 screwdriver set:Five-star screw driver: 0.8 1.2, Torx screw driver: T2 T3 T4 T5 T6 T7 T8 T9 T10 T15, Triangle driver: 2.3, Y screw driver: 2.0, Cross screw driver: 1.0 1.2 1.5 2.0 3.0, Flat screw driver: 1.0 1.5 2.0 3.0, Point screw driver: 0.8. Unique Design and Well Perform: Non-slip surface thread, the tail bearing design to help you release the tighter screws. Each screwdriver bit fits perfectly onto the handle, and can easily be changed from one to the other, so switching from different screws or projects is a breeze. Wildly Use: It's the perfect tool for all fine mechanical repair .Repairing tools for iPad, Mobile Phone, PC Laptops, Camera, Watches, Glasses & Other Electronic Devices. It's the perfect tool for all fine mechanical repair.