Using your Greenlee 0652 - 24 pocket knife is a breeze. To open it, simply press the side of the blade and pull it out. The lock - back mechanism will keep the blade in place when it's open, but make sure to engage it fully for safety. When closing, push the lock - back and gently fold the blade back in. Be careful not to cut yourself during this process. For maintenance, clean the blade regularly with a dry cloth to remove dirt and moisture. You can also use a little oil on the blade to prevent rust. Store the knife in a dry place when not in use. Avoid using it on extremely hard materials as this may damage the blade. If you notice any issues with the lock - back or the blade, stop using it immediately and have it checked.