Do pallet lifters confuse you then roller parts will confuse you even further. Because all these are not regular items that you come across at malls or other road and mortar shops but industrial tools used for different purposes. Belt conveyor might even sound familiar but you will not know that roller parts are related to belt conveyor unless you will Google for them. Such are industrial tools, only people to them know exactly what they are.
And then there are some tools like trolleys and carts whose function you can guess from their names, however they can also get confusing if you are suppose to think about the different types of them like folding trolleys with their specific purpose. While you can easily say what are aluminum hand carts you might find it difficult to say what a utility carts is as both of them are carts used for moving different things.
If all this information confuses you then you will also think of a way to help you gain adequate knowledge on all these, and there sure is a way out. Search for pallet lifters and roller parts etc independently and you will have access to all information available for all these. Most of the results displayed will be of companies selling these products, and few would be of informative sites, for your purpose you will be required to click through the informative sites. Remember when you click through these sites you will come across lots of mechanical terms and information.