Distributive pronoun indicates person, place and thing one at a time.
Each. Either and Neither are called distributive pronoun and count as singular noun and verb.
a) Each new day is different (Not says each new days are different).
b) Either boy can cross the line (Not says Either boys can cross the line).
Each of, Neither of and Either of followed by plural noun and singular verb.
a) Each of the houses is surrounded with green grass.
b) Neither of the children has passed in the class.
c) Either of these brownies is hand made.
Either and Neither can be used when we are talking about two persons, in more than two persons we used Any, No one or None.