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A drill bit specifically to penetrate hard steels and alloys. Espacially useful for drilling hardplate and drill resisting plate encountered by locksmiths and safe engineers.
Many trials were untertaken to find a better bit for drilling various types of hardplate.
We tested the drills. We drilled a high speed steel lathe tool and a hard chrome steel ball bearing with a hardness of 66 Rockwell C.
The effectiveness of the drills convinced us!