Henny Penny flat bar heater 22648 for models HCW3,HCW5, HCW8, they are rated at 1020W, 230V, the size is 650 x 75mm 3-4mm thick.
Made from galvanized steel body, mica insulation, fiberglass leads, and sleeving, the hole is for easy removal.
Some of the models they are suitable for as below.