Malco HW7X1/2ZT Zip-In Self Piercing Screw 1000 Count Carton 1,000 quantity of 1/2-inch length Hex washer zip in screws Full 1/4-inch (no. 8) head will not strip out of Hex Driver opening Instantly penetrates and engages in heavy gauge sheet metal and layered light gauge Sharp tapered point will not walk, mushroom or break Burr free, bright Zinc Plated, undercut-indented Hex washer slotted head Self-piercing screws Have a greater capacity for fastening heavier gauges of sheet metal than any other self-piercing screw Burr Free and undercut so will always seat flush Sharp tapered point will not mushroom, break or walk Full 1/4-inch (NO.8) head will not strip out of the hex driver opening at anytime during operation