If memory serves, I had one of those for a little while. The chuck used two 4-40 setscrews, and the grip on the blades was not overwhelming. Pretty things, but those older saber saws are seriously underpowered. Nice, at least, that they used the correct term (saber/sabre saw, rather than jigsaw). At the time those were being built, a jigsaw was a big stationary tool, not a handheld tool.