Set contains 630-1/4 630-5/16 630-3/8 and 630-9/16 nut drivers. 3 inch hollow shafts make it possible to work on stacked circuit boards or other long bolt applications. Tip-Ident® quickly identifies nut driver hex orientation and size by colour coding the handle ends so you can easily engage the nut driver with the fastener. Shafts are chrome-plated for smooth feel and corrosion resistance. Internal flanges provide solid twist-resistant shaft anchor. Cushion-grip handles for superior torque and comfort.