A fixture for use with a rotary cutting tool for deburring, chamferring or beveling a work piece utilized with a drill comprises a member having opposite sides with a recess defined a first of the sides by two surfaces at right angles to each other to define guide surfaces for a work piece. The opposite side resides in a plane essentially perpendicular to a plane bisecting the angle between the surfaces. A semi-cylindrical recess is defined in the member in the opposite side intermediate the ends thereof about an axis which is essentially perpendicular to a plane bisecting the angle between the surfaces. The passage extends through a portion of the surfaces and defines an opening in the surfaces whereby a rectangular cross section work piece contacting the guide surfaces will extend through the opening into the passage. A guard member having a cylindrical upper portion and a semi-cylindrical depending lower portion is affixed to the member essentially coaxial with the passage thereby enclosing the semi-cylindrical recess. The fixture may be clamped to the worktable of a drill press or vertical milling machine and a rotary cutting tool inserted into the cylindrical recess to act on a work piece extending through the opening.