These self-piercing screws feature a washer-like head design to provide great holding power and stability. There is no pre-drilling required, making these screws easy to use. Ideally, they are used with thin-gauge metal, such as sheet metal and duct work. | HILLMAN Project Center 1LB Box Truss Washer Head Needle Point Lath Screws | Size 8-32 x 1-1/2"