Lisle LIS67870 Coin Type .020 to .100in. Spark Plug Gauge

Gauges And Gaps All Types Of Spark Plugs From 0. 20 Inch To. 100 Inch (. 50mm To 2. 53mm). Tapered Edge For Gauging Spark Plugs. Specially Designed Hole With Flange Adjusts Side Wire Of Plug Without Pressuring Center Electrode.