1.【Magnetic Head】These screwdriver bits are magnetic head, so they can fix on the screw firmly.Strong magnetic, can suck the screws easily when used. 2.【High-quality materials】Adopted of high-quality S2 steel, impact-resistant and impact-resistant, wear-resistant.magnetic security head 150mm screwdriver bar, batch head surface for steel material color, from inside to outside are the same. Good material does not need to do surface decoration by decorationExternally, the quality of the lot is to look at the intrinsic Material. 3.【Hexagonal Shaft】With 1/4 in hexagonal shaft, Thanks to the wonderful workmanship, the bit not only Surface Sandblasting but also achieve high precision. 4.【6 sizes selectable】There are 6 different sizes/set, professional multi size, 1/4 edge hexagonal handle, 150mm long. Use different sizes to screw, will damage the screwdriver and screw!Using the right screwdriver, pay the least effort, and can easily unscrew the screws that suit you, can meet your varied needs. 5.【Widely used】Fit for electric screwdrivers, hand screwdrivers, electric drills, air drills, general group tools and so on.