Research Kits are used to research various items, weapons, and tools in the world of Rust. In order to research how to create it, you must first have the item. Using the kits like blueprints, you need a piece of paper, as one research requires one paper. Drag the research kit onto the item you'd like to research while standing near a workbench, and you will be able to research it, entering its recipe into your crafting menu.