Stainless Steel: Crafted from stainless steel, super rigid, sturdy and not easy to erode. Resistant to any bad weather.Curved Design: Curved design ensures perfect welding on your exhaust system. Just drill a hole and weld it. Fit for most of O2 sensors in the market. Technology: x 1.5 threads cut by latest generation of technology, high accuracy can be ensured. No worry about the specifications of the nut.Fitment: x 1.5 Oxygen Sensor Nut Weld BungMaterial: Stainless steelcolour: silverPackage Contents:4 x Oxygen Sensor Nut Weld BungOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.