1.Alloy Steel Screwdriver application of German QPQ heat treatment technology to the batch has been effectively enhaced the war resistance and fatigue resistance of the batch head that is hardly to deofmed.The coefficient of friction is 1/4of the normal quenching and the anti-bite load has increased 10 fold . 2.Non-slip Lines at Both Ends The handle body is made of special metal material, with antiskid design at both ends 3. 360°Swivel Bearing After repeated tests, our bearings have good smooth performance and efficient. 4.Improving Overall Color Impression The appearance and color of handle has been improved by design,which is more durable and non-rusting. 5.Ergonomic The handle is designed with human mechanics. It is comfortable to hold with a suitable length of 70mm and will not be fatigued after long use.