The operation of making a cone-shaped enlargement of the end of a hol

1.	The operation of making a cone-shaped enlargement of the end of a hole is known as
A.	Counter-sinking
B.	Counter-boring
C.	Trepanning
D.	Spot facing
Answer» B. Counter-boring

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The operation of making a cone-shaped enlargement of the end of a hole is known as

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