OEMTOOLS 22886 9/16 Inch Drive Magnetic Spark Plug Socket Extension Deep marking for easy identification Knurling position is optimized for best finger gripping position Applications include 2005-newer Ford Mustang (4.6L 3-valve engine) and 2004-newer Ford F150 (5.4L V8 3-valve engine) Magnetic insert holds spark plug for easy installation and removal 17mm hex top comes in handy for tight spaces