CTA Tools 3238 9 Wire Spark Plug Gap Gauge Range of Sizes: 0.025, 0.030, 0.035, 0.040, 0.044, 0.045, 0.050, 0.055 and 0.060-Inches Rugged All Steel Construction Includes Built-In Gap Adjuster Built for Resilience and Flexibility Heavy-Duty Construction Allows for Strength and Durability