MTVOR 12-4B Right Hand Indexable Threading & Grooving Holder ~ For OD threading and grooving. ~ Neutral rake. ~ Takes TNMA-43NV, TNMC-43NC, & TPMC-43NV style inserts. ~ Shank is 3/4 X 3/4". ~ Overall length is 4-1/2". ~ Insert I.C. is 1/2". ~ Screw is M4 X 10 (#2100-0074). ~ Clamp is MTH0820 (#2100-0015). ~ Locking screw is MTH0623 (#2100-0027). ~ Spring is MTH0610 (#2100-0100).