Frost King door threshold come in both residential and commercial grades and also in a variety of finishes. Aluminium and oak available. This is a 5 in. X 1/2 in. Wood threshold for interior doors. It is designed to cover and hide wood and carpet seams on the interior of doorways. The threshold has a low profile to prevent tripping and is constructed of oak. The extra wide threshold can be painted or stained to match your existing woodwork.