Inter-Fab Sure-Step ladder tread has a stainless steel bottom with slip resistant gray top tread. Heavy-duty treads for residential or commercial use. Made for Inter-Fab 304 stainless steel ladders, 1.90 inch O.D. tubing. The tread will fit rails that are 20 inches on center apart.
They are 3-1/8 inches wide and 19-7/16 inches long. Center to Center measurement is 18-1/4 inches. Each end has a 7/16 inch hole for use with standard 3/8 inch diameter ladder bolts.