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Material - Made of high quality Aluminum material, it is rust-proof, corrosion-resistant and durable for long-term use. Spark plug gap tool universal compatible with 14mm spark plugs. Easy and Fast to Use - Easy to use, compact, lightweight, easy to carry and store. Compact structure, light weight, made of carbon-steel. Knob is easier to control, reduce error and electrode damage effectively, adjust the gap more precise and fast. Easy to use -- 1. Screw spark plug into tool. 2. Determine the gap size using a feeler gauge. 3. Adjust the clearance by slowly turning the knob to apply a steady pressure.