Oxygen Sensor Curve Notched Nut Bung M18 X 1.5 Threads (2PCS)Features: Made of iron material for stability. Stable performance and long time in use. The thread pitch is 18mm x 1.5, which is the typical oxygen sensor thread pitch of 99 percent oxygen sensors on the market. FAB-PROS welded plug with round tube notch (also called "coped") to the bottom. It is well used for precision welding of your round tubes. Specifications: Condition: New Color: Shown as Picture Material: Iron Package List: 2 x Curve Notched Nut 1Made of iron material for stability. 2Stable performance and long time in use. 3The thread pitch is 18mm x 1.5, which is the typical oxygen sensor thread pitch of 99 percent oxygen sensors on the market. 4 FAB-PROS welded plug with round tube notch (also called "coped") to the bottom. 5It is well used for precision welding of your round tubes. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.