A margin trowel is a small, flat tool used primarily in masonry and plastering. It features a narrow blade, typically around 4 to 6 inches wide, which allows for precise application and smoothing of materials like mortar and plaster. The handle is usually made of wood or plastic, providing a comfortable grip for detailed work in tight spaces. These trowels are essential for finishing edges and corners where larger trowels cannot reach. They help in spreading, shaping, and smoothing materials, making them a favorite among masons and plasterers. Their compact size makes them versatile for various small-scale projects.