This produce is very dangerous because unlike a normal stabilizer it can't be secured to the rung and the rail of the ladder. This makes it susceptible to slipping up the ladder or even folding flat against the ladder. And the clamps do not fit squarely into the ladder and this also allows it to become loose while you are up on the ladder. It can't be used on the corner of a roof with rain gutters because it does not hold the ladder far enough away from the roof. I own a rain gutter business and use ladder stabilizers every day.  You can see from the photo I've included with notes added why it is very likely to become loose due to the improper way the clamps fit.  I would not recommend using this stabilizer on any ladder. In my opinion  it rates NO stars but I had to give it one star or I could not post the feedback.