A self-contained line-throwing appliance consisting of a weather proof plastic casing with an end cap, twist-grip trigger assembly, rocket and line. A line thrower is a device that is used to cast a line to a remote position. It is commonly used in rescue operations and marine activities. The line thrower can be used to establish a connection between two points, such as between ships, from shore to ship, or ship to shore, and for rescuing personnel. A1ib is one of the best companies which can provide you the best line thrower.