Boring bars can be easily recognized these by their circular bar design. They come in a variety of different sizes, with one main purpose – to make an already existing hole bigger or to refine the finish of hole.
5-Piece Steel Boring Bar Set, left-handed
5-Piece Steel Boring Bar Set - Right-handed
3-Piece Steel Boring Bar Set, Right-handed
8-Piece Steel Boring Bar Set, Right-handed, Stub length, 3/4 in. shank diameter