Each set consist of one Wedge type tool Post and one of each of 5 tool holders. Style 1: Turning & Facing. Style 2: Boring Turning & Facing. Style 4: Boring, Heavy duty. Style 7: Universal Parting Blades. Style 10: Knurling, Facing & Turning. Quick Change Tool Post Set (USA Style), Wedge Type Tool post set (6 Pcs/Set). Please be aware: The bottom plate of the tool post may need extra machining to fit your lathe. Each set consists of one Wedge type tool post and one of each of 5 tools holders. Style 1: Boring & Facing. Style 2: Boring Turing & Facing. Customer may need to machine the base plate size to fit their lathe. The Rockwell Hardness of the tool post is HRC 40 – 45; The Rockwell hardness of the tool holder is HRC 44.