Description: Made of Nylon66 material, durable, with good corrosion resistant.Easy to install, used for thread connection. Specifications:Color: BlackMaterial: NylonType: M40 Male Thread to M32 Female ThreadTotal Size: 49 x 17mm / 1.92 x 0.67inch(D*L)Outer Thread Diameter: 40mm / 1.57"Outer Thread Length: 10mm / 0.39"Inner Thread Diameter: 30.8mm / 1.21"Inner Thread Length: 13mm / 0.52" Packing Included:1 Pcs x Threaded Reducing Bushing