THREE SIZES EACH TYPE - 3 inch, 4 inch and 6 inch to fit different applications MAGNETIC HEAD - Easily attach and catch screws when screwing in and unscrewing most screws HIGH STRENGTH STEEL - Build with high strength chrome vanadium steel to prevent wearing COMFORT GRIP - Large ergonomic grip handles to easy operation LIFETIME WARRANTY - For any defects, contact us, and we will help you with our lifetime warranty.