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Q:Where is this product manufactured & where are the materials sourced from?
A:Hi M.M, Advance Auto Parts does sell Made in the USA products as well as products manufactured from many other countries in order to keep our pricing competitive. Please also keep in mind that many suppliers have multiple manufacturing plants that could result in different countries of origin for the same part.
Q:How do you read the setting on this tool? Is it done at the center of the grounding blade, or the leading edge?
A:Hi Alexander, following are the instructions for using this K Tool International Spark Plug Gap Gauge Tool - part# KTI73701: Check your vehicle owner's manual for the exact gap size to set your spark plug gap. The gap on a spark plug is the distance between the center electrode of the plug and the ground electrode that goes over the top of the center electrode. Locate the gap size on the spark plug gap tool. Slide the proper gap blade of the spark plug gap tool between the center electrode and ground electrode of the spark plug. If the gap is too wide, use your finger to squeeze the ground electrode down until it touches the blade resting on top of center electrode.