M-D Building Products 68387 Commercial Flat-Profile Threshold, Silver Aluminum, Product Description M-D saddle threshold, fluted, series: Ultra, 1/4 in width, 36 in length, 5 in height, fasteners: screws, aluminum, mill, UL listed, ADA approved, used to seal gaps at the bottom of doors. This heavy duty aluminum threshold is designed for use in commercial applications. The low profile non-skid design is recommended and approved for wheelchair access. From the Manufacturer This heavy duty aluminum threshold is designed for use in commercial applications. The low profile non-skid design is recommended and approved for wheelchair access. Made of durable aluminum for heavy traffic in commercial buildings Use to replace the threshold of a commercial building 5 in. W x 1/4 in. H x 36 in. L Silver color Protects against drafts, moisture, dust, and insects Cut threshold with hacksaw to desired length