Indexable Thread Turning Tool Holder STVOL12-3B Cutting Direction Left Hand Shank Square Shank Width 3/4 in Shank Height 3/4 in Overall Length 4-1/2 in Insert Shape TNMC-322 Inscribed Circle 0.375 in Insert Thickness 0.125 in Width Offset 0.875 in Mounting Style Screw Lock Insert Screw GTS-1 Torx Wrench T-10