The Fein Starlock Segmented HSS 196 Saw Blade features the 4" diameter blade and can cut sheet metal that's max thickness is a 20 gauge, plastics, GFRP, wood, glazing compound, brass, and bronze. It also has a circular shape that makes clean, narrow cuts that allow to work flush with the workpiece. It also has is segmented design that can make corner and edge work easier to not over cut. The blade also has a Starlock mount, which can fit all popular multifunction tool.