Designed to single wired cranes. The grab opening act can be interrupted by pressing key at any time during the period of opening, the grab will resume opening by pressing “OPEN” again It works with a battery and a remote control unit without any motor, pump, power supply, cable drum, stabilizer and so on. This type of grab constitutes 75% of the total production capacity our company. When a cylinder fails, it can work single cylinder for a while.