Technical Specs Item Helical Insert Type Free Running Material 304 Stainless Steel Internal Thread Size M8-1.0, M10-1.0 Thread Type Metric Coarse Thread Direction Right Hand Length 1D,1.5D,2D,2.5D,3D Dimension description: for example: M8-1.0x2D M8 means the thread diameter is 8mm, 1.0 means the thread pitch is 1.0mm, 2D indicates that the maximum length of the Helical Insert after installation is 2 times of the diameter, Application For Metal