Spark Plug Wrench, Fits most Engines, Use for 13/16 and 5/8 sockets, Genuine Briggs & Stratton replacement part. This OEM part ensures proper fit and performance to maintain the life of your Briggs & Stratton Equipment. Quality tested for performance and valueComplies with applicable (EPA) emission regulationsFits 13/16 inch and 5/8 inch hex spark plugs