I used this to drill holes in a Damascus steel knife blank which is quite hard in some places but can be drilled with a regular drill bit and is incredibly hard in others areas and ruined my titanium coated bits. If you are not a pro but just an amateur like me then this bit may seem expensive but having used it I would say it is well worth the money.
𧱠Bosch 2607017164 Piece Setter Masonry: Advanced Tools for Precision Masonry Work
20 Review
MICHELIN Latitude Sport 3 235/60 R18 103W summer
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Bit and socket set BOSCH Promoline (2.607.017.322), 26 pcs.
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Cordless drill driver BOSCH GSR 120-LI (06019G8020/06019G8000)
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