M-D Building Products 67106 36 In. Mill Aluminum Snap-On Sill Threshold Extender Product Description The M-D Aluminum Extender is designed to extend the depth of your sill type threshold. For best fit, used with M-D thresholds. No hardware is needed for installation. Before installation, the extender can be cut to a desired length using a hacksaw. From the Manufacturer These M-D Building Products in swing sill extenders are for TH394 and TH397 style sills. They fit sills 2-Inch deep and 36-Inch wide. Durable anodized aluminum Finishes protects 1/8 in. thick material 1/8 in. x 3/8 in. x 96 in. Satin Clear Smooth sleek finish Fasteners included Subtle minimalist finish to blend with surroundings Can be used as an interior design accent, transition strip, edge protection, exterior trim or to frame mirrors, create custom wall art or build decorative shelves