The No. 20 ratchet screw driver series (20-1, , & 3) was a variant of the popular No. 30 screw driver. The difference was that this model was made only for driving screws. There was no ‘reverse” function to it. Not a very popular tool, it was discontinued when Stanley took over North Bros in 1946. Hence it is little seen today. This model has a stroke length of 5 inches, being 12 inches long when closed, and 17 inches long when extended. It comes with one original bit, and all of its original finishes. Fine