Hoffman RJ-1 Designed specifically for solar installations. Light weight. Non-metallic, will not rust or corrode. Easy to drill and modify. Captive screws in cover will not fall out. Minimal design, small footprint. All roof penetrations cover by NEMA 4X enclosure. Dark Graphite color blends in with any rooftop. Cost effective. UV stabilized. Impact resistant. Flashing dimension are approximately 13x18 (330x457mm). Ground bar included in standard offering.