Sealtite Kwikseal Woodbinder screws are self-drilling screws designed to attach metal roofing & siding on post-frame & residential metal roof applications. Stitch screws are designed specifically to fasten overlapping panels together. Coated screws feature a tough 2.5 mils of powder coating that will not chalk or fade due to the UV inhibitor in all colored coatings. EPDM rubber is vulcanized to a steel washer to form an excellent seal even when driven at an angle.