perfect to determine if you have ignition coil failures ohh yeah didnt work on my 00 chevy silverado returned it makes the job easier this will be useless unless you pull fasteners off cars regularly a great tool lisle 35260 pulled my fasteners without breaking them five stars so im very happy to find this one that is more professional grade now i have a way to ffast and easy way to fiigure out how much tread is left works as expected nice small size helps remove plug wires in tight places best for the job good tool for servicing plugs and wires on well kept cars worked well