40Pc Tap And Die Set Metric Szie Screw Screwdriver Thread Drill W/t Pitch Gauge40Pc Tap And Die Set Metric Szie Screw Screwdriver Thread Drill W t Pitch Gauge Made of high quality hardened alloy steel, durable and superior strength. Suitable for cutting steel, copper, aluminum, cast iron and other materials. Suitable for re threading of fasteners and fastener holes, cutting or updating of internal and external threads. Precision milling of metric taps and molds are used for cutting raw materials or repairing existing threads,