Uxcell 1/2"-20 Unf Tap And Die Set, Right Hand, Round Threading Die, Hss Machine Specifications: 1/2"-20 UNF tap and die set, right hand, 2B tolerance grade. Suitable for making or repairing male and female threads. Good for general purpose applications. Application: Used for through hole processing, such as alloy steel, die steel, cast iron, ferrous and non-ferrous materials etc.. Great for maintenance and repair work. Features: High speed steel (HSS) tool provides high hardness and good wear-resistance. With fine grinding process, tap and die set is sharp and durable, and with clear thread to meet the processing requirements. Easy to Use: The fastening screw in the middle of the die wrench should be inserted into the slot of the die and tightened. The machine tap is suitable for drill presses, tapping machines, CNC and milling machines. Tips: Used with tapping oil to get threads and more durable taps. Suitable lubricating oil should be added to the cutting edge of dies and taps when tapping.