This measurement is called “projection” and can be found in the images on our product pages at our retailer partner websites. Generally, square shaped pulls will have wider projections for larger hands or knuckles. Here's an example for the solid bar pull.
A full overlay hinge covers the entire frame when closed. A ¾ inch (19mm) overlay hinge will only partially cover the frame.
We cover this and other tips in Easy Steps to Buying the Right Cabinet Hinge.