M J Enterprise

A rough boring bar is a type of tool used in machining to enlarge a pre-existing hole with a relatively large material removal rate and less concern for surface finish or tight tolerances. It’s typically the first step in a multi-step boring process, followed by semi-finishing and finishing boring bars.

A fine boring bar is a precision tool used to finish machine an existing hole to a high degree of accuracy and surface finish. It is typically the final step in a hole machining process, following rough and semi-finish boring.