If you imagine carrying a light tool bag because this is a multi-diameter tool, think twice. This tool is not for very tight nuts (it cannot hold them if the nuts are very tight), in general is way better than your own fingers but again, if the nut is solid tight it will not move it. Solution, get fixed measure drivers for whatever you face most times and keep this one as spare for the rest; remember, it works either in standard or metric. I inspected the tool, the technical concept is good but the holding teeth are not flat but rounded and that's what makes this tool fail. Klein Tool 632 Drive-A-Matic Cushion-Grip Nut Driver
I've owned this for 3 years and only used it once to try it out.
The sizes are very limited, and as other have said, it doesn't grip very well. You need to keep constant pressure to ensure it grips without rounding off your screws or nuts. Fixed measurement nut drivers are much better and faster. I've thrown this into my "extra" tool bag with all my other unused tools. Great an theory, poor in execution. - Multi-tool - Multi-driver - Nut Drivers - Screwdriver'
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