Specifications: These 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. 12 sizes a set at an inexpensive price can meet your requirements. Fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth. Item Name: Screwdriver Bit Set Quantity: 12 Pcs/Set Materials: S2 Alloy Steel Type of Head: Cross Type of Shank: 1/4 Inch/6.35mm Hex Features: Durable, 12 Sizes, Magnetic, Easy to Use Length: 50mm/1.97" (Approx.) Notes: 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 x 50mm x Φ1.6 PH00 Cross Screwdriver Bit 1 x 50mm x Φ2.0 PH0 Cross Screwdriver Bit 1 x 50mm x Φ2.5 PH0 Cross Screwdriver Bit 1 x 50mm x Φ3.0 PH1 Cross Screwdriver Bit 1 x 50mm x Φ3.5 PH1 Cross Screwdriver Bit 1 x 50mm x Φ4.0 PH1 Cross Screwdriver Bit 1 x 50mm x Φ4.5 PH1 Cross Screwdriver Bit 1 x 50mm x Φ5.0 PH1 Cross Screwdriver Bit 1 x 50mm x Φ4.0 PH2 Cross Screwdriver Bit 1 x 50mm x Φ4.5 PH2 Cross Screwdriver Bit 1 x 50mm x Φ5.0 PH2 Cross Screwdriver Bit 1 x 50mm x Φ6.0 PH2 Cross Screwdriver Bit