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A Saw blade is a tool portion that has an edge designed to puncture, chop, slice, or scrape surfaces or materials. Blades are typically made of materials that are harder than the materials on which they will be used. Historically, humans have made blades out of flaking stones like flint or obsidian, as well as metals like copper, bronze, and iron. Steel and ceramic are common materials used in modern blades. Blades function by focusing force on the cutting edge. Serrated blades, such as those used on bread knives or saws, concentrate force even more on the point of each tooth. Typically, standard circular saw blades are used to cut wood or wood composites. The number of teeth on the blade influences the cut’s speed, type, and finish. Blades with fewer teeth cut more quickly, but those with more teeth produce a finer finish. Gullets between the teeth are used to remove chips from work pieces.