From left to right: bullet, barrel, coffin and arlsey

Legers are used to give casting distance or counter weight  to a rig.

Legers come in different sizes and shapes, the main legers are bombs, coffins, barrels and bullets. The streamlined bombs can be cast long distances, the coffin lead is good in rivers as it holds the bottom better than a bomb. 
The barrel leads can be used to roll along the river bed, as can the bullet, both of these last two leads are also used in Pike rigs.

Snaps, links & swivels

Swivels and snaps come in different sizes and should be matched to the line thickness being used. The swivel is used to help stop twisting of the reel line when legering or spinning with lures. The snap-link is useful as it allows the fisherman to change leads or lures without having to tie a new knot.

Feeders

Feeders allow the fisherman to put bait on the bottom near to their hook bait, which should attract fish to your swim.

There are two types of feeders available, cage and block ended, the cage feeder is used with a ground bait, such as bread crumb. The block end feeder having small holes can be used with maggots which will crawl out of the feeder.

Feeder Rigs

The Blood Bight loop, is used to connect two lengths of line together, or to use with hook lengths. Also good loop to use with swivels and leads.
 

Link to Leger Rods