DeWalt D25404K is a versatile power tool with rotary drilling, hammer drilling, and hammering only modes. It's suitable for various tasks like drilling into steel, wood, and plastics, concrete and masonry drilling, light chipping, chiseling, and demolition applications. It also features a variable speed switch for precise control, a safety lock to prevent accidental mode changes, and an adjustable side handle for comfortable operation. Additionally, it has a depth stop for accurate drilling depth adjustment and a removable dust cover to keep the mechanism clean.