Magnetic head 4 inch . S2 steel, this batch of head using S2 steel, batch head surface for steel material color, from inside to outside are the same. Good material does not need to make the surface decoration through the exterior decoration, the of the batch is to look at the material. Features - ColorSilver - Size: 10 x 0.64 x 0.64cm - Material: S2 Steel - ,can suck the screws easily when used it. - Can be used for manual electric screwdriver, screwdriver, drill, air and other tools. - workmanship, each can be accurately locked screws, to the screw, and the screwdriver head. - package, hexagonal handle on the of 1/4inch.6inch length. Use different sizes to screw, will damage screwdriver and the screw! Using the correct , pay the less effort, and can easily unscrew the screws! Package list: 8 x Screwdriver Bits