Round Die: Thread Size: M16 x 1; Outer Diameter (OD): 38mm/1.5"; Thickness: 10mm/0.4"; accuracy class: 6g; fine grind Made of alloy steel, hardness and wear resistance for long life. Application: Round dies are suitable for general purpose wire. You can process, correct or clean the external threads. Ideal for maintenance and repair work. Features: Tapered lock hole, solid and not loose lock. Perfect for re-threading existing wires in hard materials like metal and making new wires in soft materials like plastic. Easy to use: die locating slot should align with collet screw in the middle of the die, and the screw should be inserted into the slot of the die and tightened. Tips: Should be reversed every 1/4~1/2 turn to facilitate the evacuation of chips from the chip hole. Adequate lubricating oil should be added to the cutting edge of the die when tapping the thread.