Indexable Thread Turning Tool Holder NSL12-2B Cutting Direction Left Hand Shank Square Shank Width 3/4 in Shank Height 3/4 in Overall Length 4-1/2 in Insert Shape TopNotch NG-2L Inscribed Circle 0.1875 in Insert Thickness 0.15 in Width Offset 1 in Mounting Style Clamp Lock Clamp CM-75 Clamp Screw S-310