M-D Building Products 11205 M-D Low Dome Top Saddle Threshold, 3-1/2 in W X 36 in L X 5/8 in H, Aluminum All season protection against drafts, moisture, dust and insects Heavy duty aluminum and vinyl for long lasting seal and durability Vinyl strips on base provide a weathertight seal against floor Seals gaps up to 5/8 inch high 3-1/2-inches wide by 5/8-inch high by 36 inches long