Package provides hardware to install 4 individual 36 in. wide wall mountable shelves. But you can install these side-by-side as well. For instance, 2 shelves can be installed side-by-side to create a 72 in. wide shelf to store large items. This design allows for a lot of flexibility in the not-so-perfect garage! Each individual 36 in. wide shelf can support up to 100 lbs. and is 12 in deep. Each 36 in. wide shelf is supported by 2 wall brackets. The brackets must be secured into wood studs or concrete.