Steel type of drill bit for 13mm brake cylinder resleeve

powerdoc

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I'm looking at various drill bits for the drilling out of the front brake cylinder on my Mk3 and was wondering what quality of bit hardness is required for this operation? Thanks!
 
The brake cylinder is alloy so a good brand such as Dormer or the US equivalent HSS drill, use a brand new one for sharpness.
 
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