handle design,increase friction,anti-slip. - Manual operation,light weight,simple operation and strong suction. - The micro-tightness is good,it can be operated with one hand,and it needs to be used with electric soldering iron. - Easy to disassemble for quick cleaning. - Large-capacity spring-loaded plunger removes solder quickly in one action. - The tip and "O" ring replace the tool and the internal plunger pin automatically removes the weld head each time it is used.