Durable aluminum door bottom with soft vinyl fins to seal against top of threshold and sill Great for steel doors Multiple vinyl fins provide a weathertight seal Fasteners included Vinyl seal provides protection against drafts, moisture, dust and insects Slotted fastener holes allow easy installation and adjustment Consumers and industry professionals throughout the world trust M-D Building products and services, positioning them as the leaders in the weatherstripping, floor and tile trims, perforated aluminum sheets, digital levels, and caulking categories