The OS Cable Clips are used for fastening heating cables to OS Thermo Wire. It can be used with OS 30-21 16W/m, OS GG10 10W/m and OS 30-21L 8W/m. If it is needed to change the centre distance it is not an issue because the clips are easy to fasten and remove. Make sure to fasten the OS Thermo Wire in the corners before installing heating cables. The rest of the wire is fastened after the heating cable is installed.