Commercial Electric 82215 Installation guide

Hello! I've reviewed the provided instructions for the Commercial Electric Socket Ring 316 406. This document details how to securely attach a 2.25 inch glass shade to a light fixture using a threaded socket ring. I'm ready to answer any questions you have about the installation process or the safety precautions mentioned.
What size glass shade is compatible with this socket ring?

What is the first step before installing the socket ring?

In which direction should you turn the metal shade ring when installing?