1. Used to measure and adjust spark plug . 2. printed with both metric and inch reading. 3. Heat treated spring steel wire, high hardness and not easy to deform. 4. -plated round shell, wear resistant and no rust. 5. Firm rivet linked structure, anti-impact and durable in use. Specification: Features: Used to measure and adjust spark plug . printed with both metric and inch reading. Heat treated spring steel wire, high hardness and not easy to deform. -plated round shell, wear resistant and no rust. Firm rivet linked structure, anti-impact and durable in use. Specification: Material: Metal Metric Size: 0.64-0.76-0.86-0.89-1.02-1.14 Inch Size: 0.025-0.030-0.034-0.035-0.040-0.045 Package List: 1 x Spark Plug Gauge