This deep thread nut is to be used with Switchcraft Long and L shape 3 way toggle switches where the switch passes through the body as the threaded part is not deep enough. This is not required for the short shaft switch where the thread is deep enough.
It appears you're browsing from outside the United Kingdom. As such, prices are shown without UK VAT.
If you're ordering for delivery inside the UK VAT will be added at the checkout, after you have selected your delivery country.