Craftsman 33029 is a 42-inch mulch kit designed for use with the Craftsman 42-inch cutting deck on the Revolution Zero-Turn Riding Mower. The kit includes two 22" mulch blades and one 42" deck mulch plug assembly. The mulch blades are designed to cut and finely chop grass clippings, which can then be returned to the lawn as a natural fertilizer that helps to retain moisture and suppress weeds. The mulch plug assembly fits into the deck discharge opening and helps to evenly distribute the chopped grass clippings over the lawn.