HHIP 1003-2750 S-SDUCR 12-3 Indexable Boring Bar Boring Bar Style 12-3; Shank 0.750; Minimum Bore (Inch) 1.000; Length 10 Use Insert DCMT-32.52; Screw M4x10 Use DCMT 55 degrees rhombic positive inserts; Torx Wrench T-15 7 degrees Relief Application: Profiling and copying boring bar for semi finishing.; Negative 3-Degree Lead Angle for Boring and Profiling Torx Wrench T-15