Features: 1.Made of high quality iron material for stability. 2.Stable performance and long time in use. 3.The thread pitch is 18mm x 1.5, which is the typical oxygen sensor thread pitch of 99% oxygen sensors on the market. 4.High quality FAB-PROS welded plug with round tube notch (also called "coped") to the bottom. 5.It is well used for precision welding of your round tubes. Specification: Features:_x000D_ _x000D_ Made of high quality iron material for stability. _x000D_ Stable performance and long time in use. _x000D_ The thread pitch is 18mm x 1.5, which is the typical oxygen sensor thread pitch of 99% oxygen sensors on the market. _x000D_ High quality FAB-PROS welded plug with round tube notch (also called "coped") to the bottom. _x000D_ It is well used for precision welding of your round tubes. _x000D_ _x000D_ Specifications:_x000D_ Condition: New_x000D_ Color: Shown as Picture_x000D_ Material: Iron_x000D_ _x000D_ Package List:_x000D_ 2 * Curve Notched Nut PackageList: