16PC carbon steel hole opener for drilling metal and wood easily

19mm(3/4"),22mm(7/8"),28mm(1-1/8"),32mm(1-1/4"),38mm(1-1/2"),44mm(1-3/4"),51mm（2＂，64mm(2-1/2"),76mm(3"),89mm(3-1/2"),102mm(4"),127mm(5")Black surface treatment, product is heat treated