Indexable Thread Turning Tool Holder NSL12-3B 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-3L Inscribed Circle 0.375 in Insert Thickness 0.195 in Width Offset 1 in Mounting Style Clamp Lock Clamp CM-73 Clamp Screw S-412