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This heat shrink is the larger 18mm diameter, we usually see people use this when they wish to cover connectors that have no means of waterproofing.  It has a 3 to 1 shrinking ratio, so this will eventually shrink down to a max of 6mm.  Simply heat the heat shrink with a heat gun making sure to heat evenly.  

We prefer adhesive lined heat shrink versus non adhesive lined. The added advantages are that the connection is moistureproof and the heatshrink will never move position to expose the wires underneath.

We cut this ourselves in various lengths up to a max of 1.2M (the size we get supplied) to allow you to just buy what you need and avoid waste.  Please be aware that tolerance is around -/+3% due to natural human error with a pair of scissors and a ruler.  So for example if you order 30CM you will hopefully receive somewhere between 29.1CM and 30.9CM.