Item Type: Tap Die Set Material: High carbon chromium steel Metric 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 Tap 4 x Die (One Die is on the Wrench) 1 x Tap Chuck 1 x Wrench 1Main Function: The kit is designed for thread cutting, with taps for internal threads and die for external threads. 2Application: Taps and modules are ideal for rethreading fasteners and fastener holes for automotive and mechanical repairs. 3High Performance: Tapered thickness taps and die make threading easier and smoother, preventing over threading. 4High Strength Material: Made of high strength steel, it has high hardness, good wear resistance and high durability. 5Tap 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.