UNIRAC #12-14 x 2.50 Stainless Steel Screw HDW. This screw fastener is engineered to deliver reliable structural support for UNIRAC solar mounting systems. With a #12-14 size and 2.50-inch length, the stainless-steel hardware includes an EPDM washer to aid in water mitigation and ensure a secure mounting point under varied rooftop conditions.