M-D Building Products 11809 Hardwood High Threshold, 36" L x 3-1/2" W x 1-7/16" H, Unfinished Fits doors up to 36-Inch wide Wood and vinyl design seals gaps up to 1-Inch high between bottom of door and floor 3-1/2-Inch W x 1-7/16-Inch D x 36-Inch L Natural wood provides an ideal thermal barrier