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