7FT Tall 18in Wide Manhole Ladder, ANSI Type 1, 300 lbs Rated. Box Girder 2-1/2in x 1in side rails for the utmost in rigidity and side sway stability. Corrugated round rungs. Slip resistant rubber plugs used on all side rails. Slip resistant rubber plugs used on all side rails. Slip resistant rubber plugs used on all side rails. Great sway stability