The Craftsman 42" mulch kit includes mulching blade design combined with the included mulch plug will cut and re-cut grass clippings into smaller particles, which then allows nutrients to return to the soil, helping to create a healthier greener lawn. Fits all Craftsman® 42" lawn tractor 2010 and after with the source code 247.XXXX. Easy to install. Refer to your lawn tractor's operator's manual to assure compatibility.