Hi, any tips on how to drill a hole about 42 mm in a concrete basement wall?
 
42mm drill? Costs a couple of thousand for an SDS-max.
 
You need a core drill. There are both "dry" ones and ones with water.
They are quite expensive to buy but are often available for rent...
 
If 40mm is sufficient, I would rent a regular drill with the corresponding machine. That way, you avoid messing with core drills and the like.
 
40mm and mess around a bit and soon it’s 42 ;)
 
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