Standard duty high threshold with vinyl seal All season protection against drafts insects and moisture Heavy duty aluminum for long lasting protection A standard high threshold with heavy extruded aluminum design and replaceable vinyl insert Vinyl caulking feet seal bottom of threshold Vinyl strips on base provide a weathertight seal against floor Seals gaps up to 1-3/8″ high Fasteners included Ideal for large door bottom clearances M-D Building Products today: quality that never wavers and innovation that never stands still.