HIGH GRADE STEEL - Made From heat treated steel material in a beautiful finish, which is wear resistance anti-impact, tough and to use long time. ANTI- SLIP - Magnetic Tips and anti-slip fine tooth design ensures that each edge accurately locks screws in place, resulting in less stripped screws and a more efficient work process. ULTIMATE DURABILITY - The PH2 screwdriver drill bits have high concentricity, effectively reducing the bit swinging. Great replacement for missing, bent or broken screwdriver bits. UNIVERSAL COMPATIBILITY - The universal 1/4inch(6.35mm) hex shank with power groove fits most hand screwdrivers, electric screwdrivers, and electric drills, making it a highly compatible addition to your tool collection. Overall length:25mm,50mm,65mm,75mm,100mm,150mm Color: As Shown Material: steel Package Contents: 6 Piece * Screwdriver Bits Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.