High corrosion resistance, the tip is hardened by an advanced heat treatment for enhanced durability.100% and high qualityMaterials: S2 alloy steel sand blastingColor: as shown in picFeature: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 at an inexpensive price can meet your requirements.Those bits fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth.Type of Head: cross / Type of Shank: 6.35mm / 1/4 inch hex 　Product Dimensions:PH0: Φ3.0(75mm)PH1: Φ3.0(75mm)PH1: Φ4.0(75mm)PH1: Φ4.5(75mm)PH2: Φ4.0(75mm)PH2: Φ4.5(75mm)PH2: Φ5.0(75mm)PH2: Φ6.0(75mm) 　Quantity: 1 Set(8PCS)Notes: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.Do not turn the screws with unmatched size in case get both screw and bit damaged.Please allow a bit manual measuring errors.