Teks Elite 10 x 1-1/2 in. Steel External Hex Head Washer Drill Point Sheet Metal Roofing Screws (300-Pack) provides stronger holding power and improved waterproofing. The Maximum seal (TM) washer provides improved coverage of the screw aiding in better waterproofing, even when fasteners are driven at an angle. The Hi-Grip (TM) threading help secure the fastener with stronger holding power, minimizing the need for rework down the road. The new Shank guard (TM) feature reams out the hole during install, protecting the fastener's shaft and washer from sharp metal frays that could strip the protective Climaseal coating. Finally, the self-tap drill point assists in secure metal-to-metal fastening. Overall, Teks Elite fasteners are designed for the Pro. Less rework. More productivity.