Allright mate?
starting with a maggot, they are the biggest usually used in the summer months.
Next the pinkie, which is about half the size of the maggot, and is usually used for hookbait in the winter.
Finally squatts and feeders. they are both the same kind of maggot but about one eigth of an inch long and very thin.
They are ideal for feeding into your swim, hence their other name feeders, as they don't fill the fish up as quickly as the bigger maggots, they are well worth getting.
Also breem love them.
At times I will put either one or two on a size twenty hook, if things are hard.
Feeders or squatts are brilliant escape artists if they get the least bit damp, so be carefull. They will end up all over the place.