ADDITIONAL INFORMATION:

DWG 860091 applies for dimensions only not the material(please disregard 1360280). Stainless steel 316L is needed, 16 Gauge (no dwg is available for stainless steel ladders).
In this DWG View "F" has the dimension of the tread and stringer. It is 1 3/4"inches x 3/4"inches. It also shows the punched holes on the tread.
All ladders tread are 12"inches wide as shown all over the DWG. NO holes are required to be drilled on the stringer.
Distance from the top rung to the top of the stringer is 6"inches and distance from the bottom of the stringer to the top of the first rung is 6"inches. Distance between rungs is also 12"inches.
A 10' ft ladder it will have 10 rungs and 6"inches left on the top and bottom of the first and last rung.

The drawing is highlighted to show the important areas to view (see amendment #4). Again these are standard navy vertical ladders the only difference is the material because the Drawing for Stainless Steel vertical ladders do not exist.

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