Grizzly T10438 Carbide Insert Boring Bar Set, 3-Piece This 3-Piece Carbide Insert Boring Bar Set includes right hand indexable solid steel boring bars that use 1/4-Inch Features negative 7Degree end and side cutting angle. Includes 5/16-Inch x 4-Inch, 3/8-Inch x 6-Inch and 1/2-Inch x 8-Inch boring bars Set comes with Torx wrench and fitted aluminum case with handle