Ergonomic design, easy to use and low-fatigue. Helps solve stubborn screw problems on air filters, high-end patch panels, etc. PP handle, double non-slip plastic, very comfortable to use. Designed according to the principles of human factors engineering, it achieves maximum torque. The screwdriver handle is specially designed according to the principles of human factors engineering and is comfortable and convenient to use. The professional manual screwdriver is made of chrome vanadium steel, for stronger torsion during use.