6 x 6 Galvanised Steel Trunking
The Cable Trunking and Fittings are manufactured in the U.K. 
 To BS 4678 Part 1 1971 (1988) Class 3 from galvanised sheet steel to BS EN 10143: 1993 
giving maximum protection from corrosion.
The Trunking is a return edge Cable Trunking System. 
It is used for horizontal and vertical mounting or suspension, 
across roof joists for general power distribution.