Each Wall Walker set is rated for 2 workers Wall Walkers can also be hung below the top-plate using the Mid-Wall Bracket Accessory Part #MWB6 Wall Walkers can be hung over 4"-9" walls with the included slider tube and up to 35" walls with the Long Slider Tube Accessory Part #ST1836 One set of Wall Walkers can be used with OSHA approved wood or aluminum planks If the wall is not sheeted and you can't rest the Wall Walkers along a stud, then the Stabilizer Bar Accessory #SB042 is available End Gate Accessory #EG03A is available for fall protection at the end of the plank