Carbon steel convex edge blade used for carving and whittling wood, linoleum, vinyl, foam, rubber and plastic. Made to fit the K7 Wood Carving black plastic knife. Made in the USA. Made to fit the Excel K7 Wood Carving Knife, sold seperately. Made from durable carbon steel with a sharp convex shape. Perfect for wood working, printmaking, ceramics, model making and many other applications. Made in the USA.