The fitting is designed to fit LED tubes only. It is held in place with two metal arms going out from the centre box.
The centre box has a 240v connection inside and a bracket to fit to the ceiling.
They are available in five different sizes: 2 ft, 3 ft, 4 ft, 5 ft, and 6 ft.
It is an easy way to replace a batten fitting.
Made by Covershield in UK