This complete kit will let you transform 3 Pylex Steel Stringers into a central stringer. A sturdy and elegant stair system for your backyard. This central stringer can be finished with steel， composite or wooden treads.
Connected 3 steel stringers to obtain a central stringer
Admissible load 100 lbs per square foot， ultimate load 144 lbs per square foot
Allows installation of 11-in. deep treads
Allows several tread finishes: wood， steel， fiberglass， etc.
Number of boxes required: 1 more than the number of steps need (1 steps need 2 X 13925， 7 Steps need 8 X 13925)
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