First I took a 10mm drill bit to drill a hole in the concrete, the cutting edges disappeared in the first 1/2 inch, took my old worn out drill bit and finished the job.
Pros
βΆHIGH QUALITY CARBIDE: The cutter head is made of carbide. Hardness up to 45 HRC, triangular cutting head resistance is lower. And it can improve work efficiency, higher hardness than ordinary drill bits, more wear-resistant.