This plunge-cut oscillating saw blade is made of bi-metal and measures 2¼ length x 1¾ inches width. It has an overall length of 4 5/16 inches, 19500 OPM, and a Starlock Plus connection. The straight-cutting blade has a toothed bi-metal edge that cuts aluminum, copper, plasterboard, plastic, sheet metal, and wood. There are 10 blades in a pack.