Properly working door hardware is critical to opening, closing and locking the common door. When things go wrong, certain tools are required to repair it. The most essential tool is the Screwdriver as hinges, doorknobs, locks and chain latches are all affixes to wood or metal with screws. Consequently, having a reliable screwdriver and a set with multiple heads will go a long way towards fixing the most common problems associated with a door’s hardware. But what are these hardware parts? And how do they help the door to function?