I initially bought this set to do one job - remove the stub of a rusted, broken bolt that I'd snapped a cobalt drill bit inside. I used a couple of the bits and they did the job efficiently, and they appeared to remain in good condition once the job was done. The smaller 3mm size allowed me to gradually remove the bolt's remains without much damage to the threads of the captive nut they were in, which were cleaned up afterwards with a tap.
Verified purchase: Yes | Condition: New
They can get you right in to where you need to go.
Verified purchase: Yes | Condition: New
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