The Hillman Group 47725 7 x 1/2 Black Gutter and Stovepipe Assembly/Repair Screw Self Piercing Screws penetrate metal and tap their own mating threads to eliminate the need for prepunched holes Gutter screws offer a slightly larger diameter and aggressive threads to tightly fill existing spike holes for a strong, watertight fit Black Painted Head Quantity per pack: 1LB