The Albright Knot is a fishing knot developed specifically for joining two lines of different diameters without having to use a swivel or any other hardware at the connection.
If you were to use a swivel here then you'd use a Uni-Knot at the mono side and a Haywire Twist at the single strand wire side, an altogether bulkier arrangement.
With a short wire leader the disturbance of this additional bulk may well be enough to alarm the fish, particularly in clear water.
Probably best known for joining nylon monofilament or fluorocarbon line to a single strand wire leader, but also great a great saltwater fishing knot for connecting one of the very thin spectra or dyneema braid lines to a thicker nylon monofilament or fluorocarbon leader.
Once snugged up neat and tight it's a small knot which won't catch on the line guides on the cast.
Use this knot for joining two lines of unequal diameter, for example:~
Stage 1
First, double back the end of the single strand wire leader and thread the mono through the eye produced.
Stage 2
Next, start whipping back the mono over itself and the leader.
Stage 3
Then, make about ten turns before tucking the tag end of the mono through the loop such that it emerges on the same side as it entered.
Stage 4
Finally, lubricate with saliva before smoothly pulling the knot up tight.
Trim both ends, and that's it - you've done it!
Artwork by Andrew Simpson
If you like the idea of having the most popular sea fishing knots all together in one place for easy reference, this handy little pocket guide is just the thing.
It sets out in step-by-step instructions and nicely drawn sketches how to tie all the knots you'll ever be likely to need - 18 of them in all.
Being spiral bound it opens flat, leaving both hands free to tie the knot - and it's waterproof!