Hole Tidy / Wall Grommet.
Semi opaque to blend in with your decor but it is also paintable if required.
The double version of hole tidy is for Twinsat type double cable.
Internal diameters :
Single = hole is 7.5mm (8.0mm is a tight fit).
Double = hole is 7.5mm (8.0mm is a tight fit) x 15mm.
Size of required hole in the wall :
Single = 10mm
Double = 16mm
P&P is cheaper for this item if you phone the order through !