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Allstar Gold Anodized Spark Plug Gapping Tool features a spark plug gapping tool which is made from high-quality aluminum with a steel insert and has a gold anodized finish. The spark plug gap tool sets consistent plug gaps. The following instructions should be followed: insert the plug into the holder; then put the feeler gauge between the ground strap and electrode; then gently turn the knurled knob until the feeler gauge is snug. It is backed by a 90-day limited factory warranty and sold individually.