For those owners with US cars.. many have batteries with SIDE MOUNT bolt on leads.. which can be a major PITA..

With having to change all the leads.. this 2 terminal set will allow you to bolt on .. to the end of your existing battery lead.. POST terminal connectors..

Post terminals are commonly used in Oz.. where side mounts are not. Also easier for Jump Starting  etc.

Choice is there... in practice it is then possible NOT to have to change lead ends.. and also option of not having a new height of terminal issue either.