tested them for quite a while then started offering them to guys on the forum here. They are used on a lot of the newer Nissans and also on the 96 300. They work much better than the screw clamps and do not come loose. you have to use a little caution with pliers when squeezing them and make sure you engage entire clamp in the pliers to prevent bending the tabs. I do not recommend using them on the fuel inlet lines were the hose could push off if the clamp expanded by over pressurization of the fuel system . if you look on our website you will see the hoses that we feel comfortable using them on and have been tested to work great on. we also offer a complete kit with all the hoses for the fuel rails.