Uncle Mike's Front/Rear Step Drill Set for Swivel Mounting Uncle Mike's step drill for swivel mounting features a special blade that cuts cleanly without drawing down or splintering wood Step shoulder countersinks to correct depth in one operation One drill for fore-end, one for rear For installing Uncle Mike's wood screw and machine screw bases Step drill for swivel mounting Cuts cleanly without drawing down or splintering wood Step shoulder countersinks to correct depth in one operation Includes one drill for fore-end, one for rear