The RYOBI 42" Lawn Mower Replacement Blades are the perfect fit for any RYOBI 42" Zero Turn Riding Mower. Included are (4) 21" CROSS CUT blades designed with a multi-blade system to produce extra thin grass clippings, making the mowers mulching, bagging, and side discharge experience easy and efficient. These steel blades are long-lasting, providing you with ultimate performance all season long. Replacing your dull blades with new RYOBI lawn mower CROSS CUT blades will ultimately improve your mowers cut, leaving you with a well kept lawn. These replacement blades fit models: RYRM8002.