Features Main Function --- The kit is designed for thread cutting, with taps for internal threads and die for external threads. Application --- Taps and modules are ideal for rethreading fasteners and fastener holes for automotive and mechanical repairs. High Performance --- Tapered thickness taps and die make threading easier and smoother, preventing over threading. High Strength Material --- Made of high strength steel, it has high hardness, good wear resistance and high durability. Tap Die Size --- The metric tap and plate teeth are sized in M4x0.7, M5x0.8, M6x1.0, M8x1.25, and the package includes ten accessories for great functionality. Specification: Item Type: Tap Die SetMaterial: High carbon chromium steelMetric Tap Size (MM): M4x0.7 M5x0.8 M6x1.0 M8x1.25 Metric Die Size (MM): M4x0.7 M5x0.8 M6x1.0 M8x1.25 Package List:4 x Tap4 x Die (One Die is on the Wrench)1 x Tap Chuck1 x Wrench Package List 4 x Tap 4 x Die (One Die is on the Wrench) 1 x Tap Chuck 1 x Wrench