OTC 6900 Ford F-150 Spark Plug Socket Unique and patented design works on 2004 newer Ford F-150 pickup trucks with 5.4L 3-valve Triton V-8 engines Extension is part of the socket and easily fits down spark plug tube into the cylinder head Soft rubber insert holds and protects spark plug during removal and installation Socket has 3/8 inch drive for use with a ratchet or breaker bar Socket end is 9/16 inch