Magnetic head: These Cross Shank screwdriver bits are magnetic head, so they can fixed on the screw firmly.Strong magnetic,can suck the screws easily when used it. Blue anti-slip case: Surface is covered with blue plastic material which prevent them slipping from screwdriver. Hexagonal shaft: With 1/4 in hex shaft, Thanks to the wonderful workmanship, the bit achieve high precision. widely used: Fit for electric screwdrivers, hand screwdrivers, electric drills, air drills ,group general tools and so forth. Great accessory for you. High-quality materials: Adopted of high quality S2 alloy steel, which is anti-impact and tough, great wear resistant. Magnetic torx security head 50mm screwdriver bar.Good material does not need to make the surface decoration through the exterior decoration, the quality of the batch is to look at the intrinsic material.