#14 type 17 Woodbinder screws are designed to be used as a “rescue screw”. This fastener will replace nails or smaller diameter fasteners that have loosened & backed out of steel roofing over time. 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. 5/16" HWH with bonded sealing washer will completely cover existing hole, even if elongated by movement in the metal roof. Type 17 point will help clean the existing hole so that oversized threads can tap & generate maximum holding strength. The EPDM rubber is vulcanized to the steel washer to prevent delamination & form an excellent seal even when driven at an angle.