Type 113 stop type threshold provided in ALUMOGRIT® (cast aluminum) Type 113 comes in standard height(under door) of 3/8″, standard widths are 4″, 5″ and 6″, standard surface is plain abrasive surface. Other heights, widths, and intermediate dimensions to order. Lengths are made to order. Maximum length is 8’6″ in (lengths over maximum will be made in equal sections).