Check the listing for details. 20pcs 1/4-20 UNC 2D 12.7mm 304 Stainless Steel Helical Wire Threaded Inserts. Condition: New. Listed at 12.78 USD. Specifications:Thread Size: 1/4-20 UNCEffective Length (after Installation): 2D = 12.7mm / 0.5"Free State Length: 11mm / 0.43"Free State Outer Diameter: 7.9mm / 0.31"Type: HelicalMaterial: 304 Stainless SteelSurface Treatment: White WashingPackage Content: 20pcs x Wire Threaded InsertsDescriptions:304 stainless steel has good corrosion resistance, rust prevention, high hardness, and excellent oxidation resistance. It is austenitic stainless steel, which is non-magnetic or slightly magnetic. With self-tapping sleeves, the same screw can be used continuously.Features a certain of elastic, and provides an even load on the thread. Wire thread inserts have self-tapping capability without pre-tapping the base metal. Large contact surface with finished products, strong tensile force. Strong resistance to vibration, no deformation.