Silverline - 2PC SPARKPLUG SOCKET SET (1/2INCH) - 793760 2 pce set of deep square drive spark plug sockets manufactured from chrome vanadium steel hardened, tempered and chrome plated for corrosion protection. Chamfered end for positive nut location and fitted with rubber inserts for plug retention and protection. Set contains 13/16" and 5/8" spark plug sockets.