What size spanner do I need for a spark plug?
What size spanner do I need for a spark plug? The most important tool is a socket wrench with an extension and a spark plug socket. Spark plug sockets come in two sizes: 5/8 inches and 13/16 inches. Most spark plug sockets have a rubber insert that holds the plug snugly in place. You may also need a universal joint if your spark plugs are difficult to reach. What are the 3 sizes of spark plug sockets? The Craftsman 4 piece spark plug socket set features the following sizes: 5/8, 3/4, 13/16 inch and 18mm. Each one has 6 contact...