Spark Plug Gap tool is used to adjust the spark plug gap on spark plugs, accurately and efficiently. We also have a spark plug gap chart for your reference, which converts measurements in metric to standard. This Spark Plug gapping tool includes wire gauges:

The measurement sizes are 0.020, 0.025, 0.028, 0.030, 0.032, 0.034, 0.035, 0.040.

Spark Plug Gap cross reference chart - metric to standard (mm to inch)

mm	0.4	0.5	0.6	0.7	0.8	0.9	1.0	1.4	1.5	1.6	1.7	1.8	1.9	2.0
inch	.016"	.020"	.024"	.028"	.032"	.035"	.039"	.055"	.059"	.063"	.067"	.071"	.075"	.079"