5Pcs Thread Inserts Male Female Reducing Nut Repair Tool Stainless Steel Fastener M20x2.5x2D Item Type: Thread Inserts Material: SUS304 Model: M20x2.5x2D Thread Specification: M20x2.5 (mm) Outside Diameter Before Installation: Approx. 23.6 ~ 24.2mm / 0.9 ~ 1in Length After Installation: Approx. 40mm / 1.6in Number of Turns Before Installation: 13.8 Diameter of Drilling Drill Bit for Installation: Approx. 20.5mm / 0.8in Thread Protective Sleeve Model Specification Description: For Example: M3x0.5X1.5D, which means that after the screw set is completed, the female thread is M3, the pitch is 0.5, and the length is 1.5D (length refers to 1.5 times the diameter, that is, 1.5x3=4.5mm ), the length here refers to the length after installation.