The Duralast 40-PC SAE Tap and Die Set combines the most popular standard thread repair tools, creating a comprehensive collection for professional shops or home garages. It contains everything needed for cutting and repairing damaged threads for a wide range of materials, from brass and aluminum to hardened and stainless steel. The set includes sixteen taps and sixteen dies for fine and coarse fractional thread sizes from #4 to 1/2. Additionally, there is a tap and die for NPT, T-handle, adjustable tap wrench, thread gauge, and die stock, each securely stored in the sturdy case and guaranteed for life.