Using this Greenlee drill and driver kit is easy. First, if you need to change a bit, use the ¼” Quick Change technology. Just insert or remove the bit as needed. When using the drill bits, make sure to adjust the speed according to the material you're working on. For softer materials, a lower speed might be sufficient, while harder materials like masonry will require a higher speed and the use of the hammer drill function with the appropriate masonry drill bits. When using the nut drivers, ensure they fit snugly on the fasteners. Be careful not to drop the case, although it is shock - resistant, repeated drops could still cause damage. After each use, clean the bits with a dry cloth to remove any debris. Store the kit in a cool, dry place to prevent rusting of the bits and damage to the case. Also, keep the kit out of reach of children to avoid any accidents.