I received this set of 5 drill bits last July to remove a broken screw on my elliptical. Extraction went perfectly - the hole punch allows you to drill the center of the bolt. Exactly one year later, another bolt broke on my machine (not sure if I broke it from my almost daily overuse or if NordicTrack could have built this freerider better). And I used the same reliable kit to remove that screw. The tip broke off a drill the last time I tried it, but I used a different drill to start the hole and then continued drilling with an even stronger, thinner drill to finish the hole. The HART easyout kit I have works great with this drill set. A very happy customer. PS To all the girls reading this review --> we can do it!ππ½ββοΈ