Automatically fits 15 different nut and screw sizes. Hex head adjusts to the proper size as you turn it. Drives or loosens hex nuts from 1/4 inch (6 mm) to 7/16 inch (11 mm), hex-head screws from No. 6 to 1/4 inch (6 mm) and socket-head cap screws from No. 8 to 5/16 inch (8 mm). Cushion-Grip handle to greater torque and comfort. Internal flanges provide solid, twist-resistant shaft anchor. Full hollow shafts facilitate work on stacked circuit boards or other long bolt applications. Premium chrome-plated shaft for smooth feel and corrosion resistance. Tip-Ident quickly identifies driver and size.