These are extra sets of the short stringers used in the INCRA Router Table Stand 36 and Router Table Stand 43. Using the T-slots on the outside of the legs, they allow multiple shelves to be installed at any height within the stand.
The Shelf Support Kit is great for more advanced installations, too, such as supporting or subdividing cabinets built using the INCRA Router Table Stand's unique "Panel Channel" system.
Kit includes one pair of stringers and hardware.
*shelf board not included

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