Technical Specs Item Helical Insert Type Free Running Material 304 Stainless Steel Internal Thread Size M7x1.0, M8x1.0, M10x1.0, M10x1.25 Thread type metric fine thread Thread Direction Right Hand Length 1D,1.5D,2D,2.5D,3D Dimension description: for example: M7x1.0x2D M7 means the thread diameter is 7mm, 1.0 means the thread pitch is 1mm, 2D indicates that the maximum length of the Helical Insert after installation is 2 times of the diameter,