The Hex Head Screwdriver Bits are made from S2 alloy steel, which is a commonly used material in high hardness hardware Strong magnetic, fine workmanship, high precision. each edge can be closed exactly screws, no damage to the screw and the screwdriver head Magnetic driver makes it easy to fix bit and pull out screws, can suck the screw in the vertical or tilted side Slide Driver is ergonomically shaped bi-material handle for comfort. It is also convenient to hold for long-term use These bits fit for electric screwdriver, hand screwdriver, electric drill, air drill and so on Type of head: / type: 1/4 inch hex Colour: silver Material: S2 alloy steel Size: 75mm length Package Contents: 1 x 2.5 x PH0 screwdriver bit 1 x 2.5 x PH1 screwdriver bit 1 x 4.0 x PH1 screwdriver bit 1 x 4.5 x PH1 screwdriver bit 1 x 4.0 x PH2 screwdriver bit 1 x 4.5 x PH2 screwdriver bit 1 x 5.0 x PH2 screwdriver bit 1 x 6.0 x PH2 screwdriver bit NOTES: PH0 is suitable for small equipment and precision equipment PH1 is suitable for and small devices PH2 is suitable for household screws and appliances. Do not turn the screws unsurpassed size in case you have screw and something damaged. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.