A device used to enlarge the size of an existing bore hole，having teeth arranged on its outside circumference to cut the formation as it rotates is a（n）（）.<br>A:Enlarger bit<br>B:Casing bit<br>C:Hole opener<br>D:Casing opener

A device used to enlarge the size of an existing bore hole，having teeth arranged on its outside circumference to cut the formation as it rotates is a（n）（）.
A:Enlarger bit
B:Casing bit
C:Hole opener
D:Casing opener

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