Indexable Thread Turning Tool Holder NSL20-3D Cutting Direction Left Hand Shank Square Shank Width 1-1/4 in Shank Height 1-1/4 in Overall Length 6 in Insert Shape TopNotch NG-3L Inscribed Circle 0.375 in Insert Thickness 0.195 in Width Offset 1.5 in Mounting Style Clamp Lock Clamp CM-73 Clamp Screw S-412