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 throughthe exterior decoration, the quality of the batch is to look at the intrinsic material.Exquisite workmanship, each edge can be accurately locked screws, no damage to the screw,and the screwdriver head.Strong magnetic,can suck the screws when used it.Can be used for manual electric screwdriver, screwdriver, drill, air and other tools.Professional multi size package, hexagonal handle of 6.35mm.will damage screwdriver and the screw Using the screwdriver bar,pay the less effort, and can unscrew the screws Colour:SilverMaterial:steelSize:8.5CMPackage Contents:11x Screwdriver BitOnly 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.