AutoZone Spark Plug Gap Tool No 2101 Silver Metal Circular Gauge Inches Metric AutoZone Spark Plug Gap Tool No. 2101 provides a reliable way to measure and set spark plug gaps for optimal engine performance. This circular ramp-style gauge features dual-sided markings in both inches and millimeters for versatile use on various vehicle types. The compact, durable metal construction includes a convenient keychain hole for easy storage in a toolbox or on a ring. It is a classic automotive hand tool essential for routine vehicle maintenance and tune-ups. Brand: AutoZone Model Number: 2101 Material: Metal Measurement System: SAE (Inches) and Metric (Millimeters) SAE Range: .020 to .100 inches Metric Range: 0.6 to 2.4 mm Shape: Circular / Coin Style Color: Silver Features: Keychain Hole, Ramp Gauge Type: Spark Plug Gap Gauge Measurements: • Diameter: 1.5" Keywords: Mechanic, Automotive, Car Repair, Tune Up, Engine Maintenance, Garage, Workshop, Hand Tool, Vintage Style, Pocket Too #Retro