It is equipment for the crane which has two hoisting drums and it is an efficient tool for handling scrap steel,rocks,garbage,wood,solid waste and demolition etc.The number of tines change between 3 and 8 according to capacity of grabs.it has one line opening and one line closing functions. The mechanical structure for opening and closing is succinct and original. No maintenance required except greasing. It is easy to use and can work under any circumstances in order.