I don't know if you would call this a tool, but it upgrades a tool. I saw these on You Tube, watched the video, and went to the site and looked at them. I didn't buy it than. A few days later I get a email with 40% off. So I got two of them for 23.00 and 5.00 shipping. These work very well...I was amazed. Just not built for tight spaces.
A few companies actually make similar products. The one I bought recently was Flexzilla brand.