Use to set and measure spark plug gaps plus other ignition clearances from 0.010 to 0.045" (0.254 to 1.143mm).
Six wire gauges check spark plug gaps and 12 straight blades check other clearances. It includes a double-ended electrode tool for easy adjustments. Blade Lengths: 3-5/16" long

• 6 Spark plug gap wire gauges: Thousandths: 0.025, 0.030, 0.034, 0.035, 0.040, 0.045 -- MMs: 0.635, 0.762, 0.864, 0.889, 1.016, 1.142
• 12 straight blades: Thousandths: 0.010, 0.012, 0.015, 0.016, 0.017, 0.018, 0.019, 0.020, 0.022, 0.024, 0.025, 0.026 -- MMs: 0.254, 0.305, 0.381, 0.406, 0.432, 0.457, 0.483, 0.508, 0.559, 0.610, 0.635, 0.660
• Double End Electrode Adjusting Tool.
• A product of K-D Tools. MADE IN USA!