Toolwiz Spark Plug Gap Tool, Spark Plug Gapper Tool Compatible with 10mm 12mm 14mm 16mm Spark Plug, Spark Plug Gapping Adjustment Tool with 32 Blade Feeler Gauge Spark plugs require a precise gap to ensure proper ignition of the air/fuel mixture, and gapping them requires appropriate tools for your vehicle's specific plugs. Therefore, using a spark plug gap tool is vital. Toolwiz Spark Plug Gap Tool will be a perfect choice for gapping vehicles’ park plugs adjustment FEATURES ★ Toolwiz spark plug gap tool fits for 10mm 12mm 14mm 16mm spark plugs. (NOT compatible with 18mm thread, long reach, or short reach plugs.) ★ Works for non-preset gap spark plugs; Iridium/Platinum spark plugs usually do not require adjustment ★ Solid construction with unique design allows the spark plug gapper a high precise performance ★ Come with quality dual reading steel feeler gauges for more precise work and gap measuring ★ Easy to operate. No need third hand help PRODUCT DETAILS Material: Aluminum Color: Black Feeler Gauge: 32 Blades Measuring Range: 0.001inch to 0.04inch (0.03mm to 1mm) Gapper Fitment: 10mm/ 12mm/ 14mm/ 16mm Spark Plugs Package Size: 6.3 x 1.5 x 1.4 in/ 160 x 38 x 35mm Item Weight: 4.9 ounces HOW TO USE 1. Simply place your spark plug onto the spark gap tool. 2. Use your desired size feeler gauge for gap thickness measuring. 3. Put the feeler gauge into the spark plug, screw the knob till the side electrode compresses to the desired gap thickness. 4. Unscrew the knob to loosen the spark plug and finish the spark plug gapping adjustment. Important Note: Some spark plugs electrode spring back is normal, this will vary for each spark plug brand, manufacturer, and material. Please use the feeler gauge 2mm less than your desired spark plug gap in size. PACKING INCLUDE 1 x Spark Plug Gap Tool 1 x Feeler Gauge