Check the listing for details. Stainless bung Metric thread,used for welding. 18mmthread (x1.5). Condition: New. Listed at 3.75 USD. EXTRA LONG .625"long LONGEST ON EBAY 304 STAINLESS STEEL Very easy to weld. 18 mm X 1.5 thread pitch, Wide band O2 sensor bung. 1. inch OD. .625 total length. 18 mm. X 1.5 thread pitch. Will fit most standard as well as most Wide band O2 sensors. Made from ISO 9000 approved 304 stainless steel.. Most vehicles use a standard 18 mm x 1.5 thread O2 sensor port. These bungs will accept most all standard sensors from most manufactures. If your O2 port is stripped or damaged, or the sensor is frozen in the port, These bungs are what you need to repair your exhaust system. If you are building a custom exhaust, or just replacing a stock exhaust system, these bungs are what you need. These weld bungs can be welded over an existing hole, or over a 7/8 hole that you drill. We make hundreds of these bungs, spacers, bushings and bosses. "inch and metric." Email me thru Ebay with questions and we can list the part and quantity you want. Thick enough to not warp when you weld them. Thin enough to not add too much weight. MADE IN THE USA! See my other listings for PLUGS that we make for these.