That tool would be used to open or close the gap in the spark plug.
Performance Tool Combination Tune-Up Thickness Gauge, 24 Blades, Model# W80529

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Buy 24 or more at $6.29 ea.
- Steel blade sizes include .010in. (.254mm), .012in. (.305mm), .015in. (.381mm), .016in. (.406mm), .017in. (.432mm), .018in. (.457mm), .019in. (.483mm), .020in. (.508mm), .022in. (.559mm), .024in. (.610mm), .025in. (.635mm), .026in. (.660mm)
- Brass non-magnetic blade sizes include .006in. (.152mm), .008in. (.203mm), .010in. (.254mm), .012in. (.305mm), .014in. (.356mm), .016in. (.406mm)
- Wire test loop sizes include .025in., .030in., .034in., .035in., .040in., .045in.
- Contains: 12 straight steel blades, 6 straight brass blades, 6 wire test loops, electrode adjuster.
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