ITEM NAME:M18X1.5 O2 Oxygen Sensor Fittings Mounting Bung And Plugs (1 Bungs/1 Plugs) Description: Super good 304 stainless steel. Durable, never fade. Withstands high exhaust temperature. easy-to-screw threads or can also be welded. Perfect to replace old or broken nut. Specification: Material: 304 stainless steel Plug Outer Diameter: Approx 25mm Plug Length: Approx 16mm Bung Outer Diameter: Approx 25mm Bung Length: Approx 13mm Thread: M18*1.5mm Package Includes: 1 Piece O2 Nut Note: Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Please check the size measurement and the picture carefully before making.Bung Length: Approx 13mm. 1 Piece O2 Nut. Withstands high exhaust temperature. Due to the difference between different monitors, the picture may not reflect the actual color of the item.