This is an authentic replacement part manufactured for use with Craftsman walk-behind lawnmowers. The blade is angled to allow the clippings to rotate through the cutting deck to produce fine clippings for side discharge and mulching. Lawnmower blades wear out over time and can cause the grass blades to tear making frayed endings that can diminish the look of the lawn. A new mower blade will allow for a cleaner cut keeping the lawn looking good. This blade is sold as an individual replacement part. 21&#34