That is a fine tool for stripped Phillip screw extraction. Bolts are a whole different animal. If the bolt head is rounded off, it’s a good bet that we have a stuck bolt. You would be far better off using a spiral socket. Spiral sockets grip the outside of a bolt giving you the best chance of reaching the necessary torque. The smaller the grip device the greater the chance of exceeding the tools mechanical ability(ie breaking).
Then there are broken bolts. The trick to removing a broken bolt is successfully drilling a center hole. Not so easy on a broken bolt.
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