High Quality: The Screwdriver Bits Are Made Of High Quality S2 Steel, Adopted High Quality S2 Steel, Which Is Anti-Shock And Sturdy, Very Wear-Resistant, Makes These Screwdriver Bits Sturdy And Durable Powerful Function: The Hex Head Screwdriver Bit Set Is Magnetic Which Helps Keep Nuts And Bolts Stuck To Them. They Insert Directly Into The Impact Drivers, And Once Inserted Into The Impact Driver, They Will Not Fall Out. Various Sizes: Multi-Size Professional Packaging, Hexagonal Handle On The 6.35Mm Brim And 100Mm Length. Size: T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40. Use Different Sizes To Screw, Will Damage The Screwdriver And The Screw Using The Right Screwdriver Bar, Pay Less Effort And Easily Unscrew Screws High Precision: Home Screw Use Ph2 For Major And Large Electrical Use Ph1, Ph2 For Large Electronics Use Ph0 , Ph1 For The Major. Precision Instruments Use Ph0, Ph00 For Major. (Ph1 Is Sharper Than Ph2, Ph0 Is The Sharpest) Wide Use: Hex Shank Screwdriver Bits Is Suitable For Professional Maintenance Personnel, Computer Maintenance, Camera Maintenance, Glasses Maintenance, Phone Maintenance. Instrument, Manual Electric Screwdriver