Specifications: 190mm (1") die for 17mm to 20mm capacity, with an adjustable screw. Included metric round die sizes: M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5, M12 x 1.75. Application: For general purpose threading. Perfect for re-threading existing threads in hard materials like metal, or creating new threads in soft materials like plastic. Great for maintenance and repair work. Features: The die stock offers good wear resistance for long service life. With 4 adjustable screws, the die stock can securely hold the round dies. The round die features a tapered locking hole. Easy to Use: The groove The die positioning plate should be aligned with the fixing screw in the middle of the die key, and the screw should be inserted into the die slot and tightened. Tips: It should be reversed every 1/4 to 1/2 turn to facilitate the discharge of the chip from the chip hole. Appropriate lubricating oil should be added to the cutting edge of the die when tapping threads.