Home > Products > Doors > Door Parts > Thresholds > Adjustable Height Threshold Randall Adjustable Height Threshold Made with unfinished oak Measures 3-1/2″ wide For gaps 3/4″ x 1-1/8″ 3′, 4′ or 6′ in length Model number W-9-U Length Choose an option3'4'6'Clear Adjustable Height Threshold quantity Add to cart Add to basket for Quote Purchase online at our TotalWood Store * Please select length and quantity to add to basket for quote.