The Thread Wizard Metric Bolt Cleaner Tool allows the user to clean dirty or rusted threads. Designed to easily clean right and left handed, coarse and fine threads. CONVENIENCE: The world's safest and fastest bolt cleaner. HARD BRISTLES: The hard wire wheel within the tool helps brush and clean off rust, dirt and grime from external bolt threads. QUICK FIX FOR DIRTY THREADS: able to be locked in a vice for an easy and thorough cleaning of dirty threads MADE IN THE USA: American made product with high quality materials.