Dexter Quick-Fit Swivels
The QF Swivel is a unique two part swivel which consists of a swivelled body and a detachable eye. The idea is to tie the body onto the end of your leader and then fit an eye on to each of your rigs. This then allows you to quickly change rigs whilst fishing so as to maximise fishing time.
This process of having spare baited traces ready to use is known as 'double patting' and was conceived by shore match anglers to save wasting fishing time as you bait up your hooks. It is such a good idea that it is now common practice for many pleasure anglers as well.