I had a hole saw for big holes in rock. The stand was removed from the motor, which was attached with four 10mm bolts. It was easy to drill and drill holes with this set. The set lets you guess which drill, which tap and which spiral go together. Everything is stacked together, although they seem to fit tightly together. Each item is labeled in the box, not so much on the tools. I drew a line around each sentence to avoid confusion. Because of the layout, the process was easy and quicker than if I had bought spiral coils, they tried to match the screws and taps. I would still have to do a workaround to insert the spiral coil as well as the punch/breaker for spiral coil approaches. (Removing it would allow the screw to thread and tighten past the spiral coil.) I made sure to blow all the metal out of each hole and clean the faucet after each hole. Then I used the "medium" LockTight on the screws. I have great faith in my work but if things fall apart I will let you know. This drill is used in extreme conditions so I think it will be fine for most repairs.
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