BMS Billet Spark Plug Gapper — 12 mm or 14 mm, With or Without Gauge

What this part does

The BMS billet gapper lets you adjust plug gap with controlled pressure to avoid damaging the fine electrode. Correct gap supports consistent ignition, especially on a turbo engine; use the engine or tuner specification for the target value.

Package and selection

Choose the 12 mm version for BMW/MINI applications or 14 mm for Kia/Hyundai 3.3L, then select whether you need the specialty feeler gauge. Gauge bundles add four blades: 0.018, 0.020, 0.022, and 0.024 inches. Confirm plug diameter before ordering.

Fitment

For plugs with the matching 12 mm or 14 mm thread size. Tool size does not determine spark-plug heat range; verify the plug part number separately.