Special design for R410A system
Easy operation, save time and energy
The special cone eccentric revolution allows the internal opening gradually and from 45° accurate and regular flare without effort, preventing tube from sliding down. Theare face to be smooth, uniform without scratching. 
Eccentric cone will be rebound automatically after the work finished, make the idle top head in revolution again for 1-2 times and have the face in friction to make it pretter.