The 6491X single core cable is made in six sizes. The sizes include 1.5mm, 2.5mm, 4mm, 6mm, 10mm and 16mm. All sizes are available in red, black, blue, yellow, grey and green and yellow. They are mostly used in commercial and industrial installations. They are designed for drawing into trunking and conduit systems. Typically for lighting and power circuits as well as sub-main circuits.