Description: Made of Nylon66 material, durable, with good corrosion resistant.Easy to install, used for thread connection. Specifications:Color: BlackMaterial: NylonType: M16 Outer Thread to M20 Inner ThreadTotal Size: 29 x 27mm / 1.13 x 1.05inch(D*L)Outer Thread Diameter: 15.8mm / 0.63"Outer Thread Length: 10mm / 0.39"Inner Thread Diameter: 18.8mm / 0.74"Inner Thread Length: 12mm / 0.47" Packing Included:1 Pcs x Threaded Bushing