Technical SpecsItem Helical InsertType Free RunningMaterial 304 Stainless SteelThread Type Metric CoarseThread Direction Right HandDimension description: for example: M3x0.5x2DM3 means the thread diameter is 3mm,0.5 means the thread pitch is 0.5mm,2D indicates that the maximum length of the Helical Insert after installation is 2 times of the diameter,Length 1D,1.5D,2D,2.5D,3D （Maximum stretch length after installation ）