Specifications: Those bits fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so on. Those long cross screwdriver bits are made of S2 alloy steel which is a commonly used material in hardware with high hardness. Magnetic bits can be firmly fixed on screwdrivers. 8 sizes a set can meet your requirements. Usage: PH0 is suitable for small appliances and precision apparatuses. PH1 is suitable for major and small appliances. PH2 is suitable for household screws and major appliances. Type: Screwdriver Bit Material: S2 Alloy Steel Type of Head: Cross Type of Shank: 6.35mm(1/4 inch) Hex Features: Long, Magnetic, 8 Pcs in 1 Set, Easy to Use Length: 7.5cm/2.95" (Approx.) [PH0] Bit Diameter: 3.0mm/0.12" (Approx.) [PH1] Bit Diameter: 3.0mm/0.12" (Approx.) [PH1] Bit Diameter: 4.0mm/0.16" (Approx.) [PH1] Bit Diameter: 4.5mm/0.18" (Approx.) [PH2] Bit Diameter: 4.0mm/0.16" (Approx.) [PH2] Bit Diameter: 4.5mm/0.18" (Approx.) [PH2] Bit Diameter: 5.0mm/0.20" (Approx.) [PH2] Bit Diameter: 6.0mm/0.24" (Approx.) Notes: Do not turn the screws with unmatched size, in case get both screw and bit damaged. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Set of Cross Screwdriver Bits(Total 8 Pcs)