This is an unused wire wound adjustable 1.6K ohm 100 watt resistor. It is 162mm long by 19mm outside diameter of the tube. The tube is made of ceramic with wire wrapped around it and a hard plastic covering most of the tube. There are two screw clamps making the mounting of this item adjustable. The two connection points are the copper extension with screw and the threaded screw with copper washer at the one end..