Allstar ALL96515 Gold Anodized Spark Plug Gapping Tool Spark plug gapping tool 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 Simply insert the plug into the holder, then put the feeler gauge between ground strap and electrode, then gently turn the knurled knob until the feeler gauge is snug Sold each Backed by a 90-day limited factory warranty