COMPLETE SPARK PLUG KIT - Includes 5/8", 9/16", 14mm, 16mm sockets in 4", 6", 10" lengths plus ratchet handle and spark plug gapper - everything needed for professional spark plug service. SUPERIOR MAGNETIC RETENTION - Features strong magnetic cores that securely hold spark plugs during installation and removal, preventing dropped plugs from damaging engine components in hard-to-reach areas.