Ideal for numerous DIY tasks, this wrench is a great time saver as it opens and closes at the touch of a button. If you are working in tight spaces in particular you will find it a great help. Its also a brilliant gift idea. Automatically Adjusts at the push of a button., Uses 2 x AAA batteries, 2-Year Guarantee, Adjusts automatically to any size nut or bolt up to 1 1/4", Heat treated hardened steel, strong enough to 220 ft-lbs. of torque