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For spark plugs 14mm x 1.25mm pitch Complete thread repair kit specifically for repairing spark plug threads No drilling of the old thread required - JUST use the V-Coil pilot-nose tap Kit includes a total of 15 wire thread inserts: 5 at 8.4mm long, 5 at 12.4mm long and 5 at 16.4mm long (when installed) V-Coil wire thread inserts manufactured from aerospace specification stainless steel