Indexable Thread Turning Tool Holder ADNEL20-4D 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-4L Inscribed Circle 0.375 in Insert Thickness 0.255 in Width Offset 1.63 in Mounting Style Dor-Lock Clamp JSLC-HP76 Clamp Screw JSCS-04