Excellent Material: S2 high quality steel, this batch of head using s2 high quality 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 quality of the batch is to look at the intrinsic material.Powerful Function: Strong magnetic, good workmanship, high precision. Each edge can be accurately locked screws, no damage to the screw and the screwdriver head.Exquistie Workmanship: Home screw use ph2 for major, surface is finished by titanium coating which gives bits a high hardness and beautiful color.the hardness of the product reached hrc58-62 degrees.Wide Using Appliaciton: With 1/4 in hex shaft, they are widely used on electric screwdrivers, hand screwdrivers, electric drills, etc.Package Contents: 10 x Anti slip electric screwdriver bits.professional, fast and convenient.