Basically it consist of cutting 2 x 4 lumber into 18" strips and screwing them to the framing of the garage. That's all there is to it.
Cut some 2 x 4s into 18" sections
Pre-drill two holes for the screw in each 2 x 4.
(I didn't do any measuring.. I just kind of eyed where the holes should go)
Screw them in at a slight angle to the framing of your garage.
Viola! A very quick, cheap and easy hanger for tools in your garage.