Not really sure about this product. First of all, I tried to use it as a means of not taking a vehicle to a mechanic to get a belt replaced since the vehicle it was going on is strictly for beach use, this was in no way an emergency. It was very to difficult to get the belt on the alternator of a 1998 Mitsubishi Montero Sport while at home in the garage and I eventually gave up, would've had NO CHANCE in this particular situation along side the road somewhere.
I received this item as a gift and had been carrying it in my cars emergency kit for 8-10 years. When a friends van threw a belt I really thought this would save the day and make me look like a hero. WRONG! We installed it fairly quickly without any difficulties, but after driving less than a mile it just snapped. I'm sure we put it together properly.