Powerbuilt 12mm Back Tap Spark Plug Thread Repair Tool - 641148 Size:12mm Unique round cutting blades can

Unique round cutting blades can be rotated and reversed for long life

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surface defect particles or any sanding residue for best pro finishing results

Pilot diameter is 3

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Powerbuilt 12mm Back Tap Spark Plug Thread Repair Tool - 641148 Size:12mm Unique round cutting blades canPowerbuilt 12mm Back Tap Spark Plug Thread Repair Tool 641148 Read more Powerbuilt 12mm Back Tap Thread Repair Tool The Back Tap's patented collapsible design allows it to engage be placed through the spark plug hole and into the chamber. A mandrel is then drawn back, expanding the tool's threaded area and threading into the clean threads at the bottom of the spark plug hole. The Backtap repairs the damaged thread as it is drawn up through the spark