1. Manual or Drill Mode The tube expander kit features 2 operating modes: manual and electric drill. The manual mode is more convenient, while the electric drill mode is more laborsaving. You can choose either mode according to your needs. 2. Eccentric Cone The eccentrically mounted flaring cone made of hardened steel creates a rolling effect for uniform metal flow, ensuring even flared walls without wear. Applicable tube outer diameters: Φ1/4', 5/16', 3/8', 1/2', 5/8', 3/4' (Φ6/9/10/12/16/19mm). 3. Limit Block Coupling (1) After inserting the copper tube, the length of the flared tube can be precisely controlled by the limit block. (2) The rotating handle includes a coupling that automatically disengages once the flaring process is complete. 4. Wide Application The tube flaring tool is suitable for soft metal tubes such as copper/aluminum tubes. Widely used in electrical products like HVAC, air conditioners, air heaters, refrigerators, etc.