A grozing iron, also known as a fettling knife or a glass cutter, is a versatile tool used in the art of stained glass making. This handheld instrument consists of a metal blade with a pointed and curved tip, designed specifically to shape and trim glass pieces during the crafting process. While commonly referred to as a grozing iron, it can be synonymous with other names within the industry, such as a glass grozing tool or a glass nipper. However, regardless of its name, the grozing iron remains an essential tool that allows artisans to meticulously shape and refine their glass creations with precision and accuracy.