Small Boring Bar for Tracing ID Contours Shank Diameter Length Bore Depth Min. Bore Diameter Insert Length Radial Angle 5/16" 3.98" 0.78" 0.37" 0.22" 7° Features include... The ultimate small boring bar for tracing ID contours, utilizing idexable inserts Ingenious geometry of the insert and angle positioning of pocket provide for utmost cutting performance and unrestricted chip flow. Round shanks with longitudinal flats for proper radial positioning Shank diameter tolerance: + 0.000 - 0.001" Positive seating of carbide inserts High quality steel shank