ALL COMMON SIZESThis 7pcs spark plug socket set comes in different sizes including 14mm, 18mm, 1316 inch, 58 inch, and 34 inch, plus 1pc universal joint and 1pc 3 extension bar. EASY TO READ Each socket has the size stamped on it, you can easily find it in your time of urgent need. QUALITY PRODUCT Spark plug gap tools are constructed from premium quality chrome vanadium steel with a mirrorpolished chrome finish that resists corrosion. PROFESSIONAL DESIGNSixpoint socket design grips the flat sides of fasteners preventing roundoff, each socket has a rubber support system inside to help protect and hold the spark plugs, extension bar, and universal joint help the socket to be long enough to go deep and accommodate the size of the spark plugs. SERVICE GUARANTEE In the LLNDEI store, all products meet or exceed ANSI performance standards. It comes with a lifetime warranty