CR-20 installation accessory is available in gold or chrome. CR-20 installation accessories are suitable for fibres C-Flex / S-Flex 4 - 6 with an M8 end fitting. CR-20 access hole diameter is ø 14 mm and the external diameter ø 18 mm. The length of the crystal part is 12 mm. The installation requires 35-45 mm of free space behind the ceiling or wall surface.