Etching tools are tools used to carve or engrave a design into a hard surface. The most common etching tool is the stylus, which is a pointed instrument that is used to draw or write on a surface. Styli are typically made of metal, wood, or plastic and come in various sizes and shapes. They can be used to create intricate designs or to simply scratch a surface. Etching tools are used in a variety of industries, including jewelry making, printing, and engraving.