A broaching bushing for guiding a broaching tool in a workpiece bore during the cutting of a keyway of in an annular surface of the bore. The bushing having two main components: a wedge-shaped member and a broaching tool guide member positionable in longitudinally abutting relation to one another to form a broaching bushing of substantially rectangular cross section for insertion in the workpiece bore. The width of the rectangular cross-section is adjusted to tightly fit the bore by the longitudinal shifting of the wedge and guide members relative to one another. The bushing is sizable to fit into a plurality of standard bores or non- standard undersize or oversize bores.
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