Indexable Thread Turning Tool Holder NSR20-4D Cutting Direction Right Hand Shank Square Shank Width 1-1/4 in Shank Height 1-1/4 in Overall Length 6 in Insert Shape TopNotch NG-4R Inscribed Circle 0.375 in Insert Thickness 0.255 in Width Offset 1.5 in Mounting Style Clamp Lock Clamp CM-72 Clamp Screw S-412 Shim SM-420 Shim Screw SL-344