Sketching tool is a term used to describe a tool used for drawing or sketching. The most common tool used for sketching is a PENCIL, which is a 6 letter word. Pencils are made of graphite and clay and have been used for centuries for writing, drawing, and sketching. They are easy to use and come in a variety of sizes and shapes. Pencils are also relatively inexpensive and can be found in most art supply stores.