Features: Universal for 10mm 12mm 14mm 16mm spark plugs.Used your desired size feeler gauge for gap thickness. This for Spark Plug for Gap Tool will give you that perfect for gap every for time.Simply place your for spark plug onto the for gap tool perfectly, this made it sooo easy to for gap precisely. Simply place your for spark plug into the for gap tool. Use your desired size feeler gauge for gap thickness. Turn the knob with the feeler gauge in place till the side electrode compresses to the desired for gap thickness. Specifications: Material:Aluminum Alloy Size:Approx.16x5x5cm/6.3x1.97x1.97in Color:Red,Black Net Weight:240g Package Includes: 1Set for Spark Plug for Gap Adjustment Tool note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.