Items that work with Ashe's Q

I've been playing Ashe for awhile now but there are still things I'm still trying to figure out. I've read on many different sites that Ashe's Q procs items that are on-attack multiple times, such as Runnan's Hurricane, while it will only proc on-hit effects once, items such as Wit's End. The problem I'm having is distinguishing between on-hit items and on-attack items as they seem similar to me. It would be a big help if anyone can help create a list of items that are on-attack so that people can theory craft more builds for Ashe.