50Pcs Wire Thread Insert Stainless Steel Bushing Screw Hole Repair Socket Kit US Units 5‑40 Item Type: Wire Thread Insert Material: SUS304 Standard: US Units Model: 5-40 Diameter: Approx. 3.175mm / 0.13in Pitch: Approx. 0.64mm / 0.03in Outside Diameter Before Installation: Approx. 4.0-4.4mm / 0.16-0.17in Drill Bit Diameter: Approx. 3.3mm / 0.13in Thread Protective Socket Model Specification Description: For Example: M3 x 0.5 x 1.5D 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, 1.5 x 3=4.5mm) , the length here refers to the length after installation. Wire thread inserts are also called threaded sheaths, stainless steel threaded sockets, wire sockets, and braces. They are a new type of female threaded fasteners made of high-strength, high-accuracy diamond-shaped cross-section steel wires; Application to low-strength engineering materials such as aluminum alloy, zinc alloy, copper, plastic, etc., can significantly improve thread strength and wear resistance.