The Carlisle 322735 HP-X Fasteners #15 Heavy Duty 20" Roofing Screws are a high-quality fastening solution designed for heavy-duty applications such as roofing. With a thread size of #15 and a length of 20 inches, these screws offer excellent holding power and durability. The 250ct box ensures that you have an ample supply for your project, making them a convenient and reliable choice for any construction or repair job.