I bought these a few months ago and the first piece I pulled out of the box was top notch. I've been using it for several months and have no complaints, probably 90% of the dewalt bits I've broken and replaced. Fast forward a few months and this drill will break due to a tipping drill rig. It's okay, there are three more. The two bits are useless, the tip has about 3/16" of wobble and the best of the three remaining blades probably has 1/8" of wobble left. I've tested them on several drill bits and compared to longer blades, my drill bits aren't the problem. Either the bits are bent/deformed (I don't know how, considering how brittle these types of bits usually are), or they are just poorly assembled and pinned. If it wasn't for the terrible quality the bits would be a good substitute for more expensive bits like Dewalt.