Item Type: Wire Thread Insert Material: SUS304 Model: M18 x 1.5 x 1D Thread M18 x 1.5 Length After Installation: Approx. 18mm / 0.7in Number of Turns Before Installation: Approx. 9.8 circlesOutside Diameter Before Installation: Approx. 21.4-22mm / 0.8-0.9in Drill Bit Diameter: Approx. 18.4mm / 0.7in Wire Thread Insert Model Description: For Example: M3 x 0.5 x 1.5D, which means that after the screw is set, the female thread is M3, the pitch is 0.5, the length is 1.5D Length refers to the length of 1.5 times the diameter, that is, 1.5 x 3=4.5mm, the length here refers to Is the length after installation. Wire thread inserts are also called threaded sheaths, stainless steel threaded sleeves, wire sleeves, and braces. They are a new type of internal 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. Package List: 10 x Wire Thread Insert