Indexable Thread Turning Tool Holder STVOL16-4D Cutting Direction Left Hand Shank Square Shank Width 1 in Shank Height 1 in Overall Length 6 in Insert Shape TNMC-432 Inscribed Circle 0.5 in Insert Thickness 0.187 in Width Offset 1.25 in Mounting Style Screw Lock Insert Screw GTS-2 Torx Wrench T-20