[Specifications] - Screw Type: Set Screw, Material: 12.9 Carbon Steel, Pitch: 0.5, Thread: M5, Length: 4 mm, Inner Hole: 2.5 Hexagon [Material] - The set screws are made of carbon steel with sufficient strength. [Application] - Suitable for carbide insert CNC lathe turning tool holders. [Black Oxide] - The screw surface has been treated with black oxide for greater durability. [Note] - Before purchasing, please check if the screw size is suitable for your turning tool holder. Opened for inspection and photography, so listed as "Like New". Never used. 2234