originally bought the Dewalt package, which is really, really hard steel it snapped in the hole. Now this is a really small screw in a lawnmower, holding the transformer in place that sparks the spark plug as the magnets float by, so I couldn't go bigger. Used a grinder to make an [X] on top center of hole titanium impact bits from Harbor Freight to cut the initial hole break bit.The larger grooves some PB blaster, allowed the metals to collect as I turned the new tap, so I could screw unscrew, blow out/wipe repeat, until the hole was clear for a new screw to go in.Dewalt's pack, just didn't have deep enough grooves for the metals snapped when I was unscrewing, which was likely my fault. But this bit allowed me to go deeper, so it was quicker a better choice for my project.
Rating: [5 of 5 Stars!]