Seco Indexable Turning Tool Holder, DSKN Tool Holder, 114.3 mm Overall Length, Square Shank, 78.3 mm L x 19.1 mm W Shank, Insert Compatibility: SN..43.., Left Hand Cutting, 12.7 mm Inscribed Circle, 25.4 mm Back of Bar to Cutting Edge, 75 deg Lead Angle, 33 mm Head Length, ANSI Code: DSKNL-12-4B, Negative Rake, Steel