Identify whitworth and metric threads.Essential when restoring or repairing old cars,motorcycles and machinery.Helps order the correct fixings,nuts and bolts,avoids damaging imperial tapped holes or bolts by forcing on metric parts.Measures from 4 to 62 TPI imp and 0.25 to 6mm metric.I have lots of other imperial tools for classic cars,bikes and trucks please have a look.
