The Genuine Factory Parts 42" Mulch Blade Set is designed to cut grass clippings into finer pieces so they can be redistributing back into your lawn, providing essential nutrients. When used with a mulch plug, clippings are recirculated in the deck so they can be cut and recut into smaller pieces. Genuine Factory Part blades are original equipment blades for CRAFTSMAN, CUB CADET and TROY-BILT. Designed for precise fit and optimal performance, you can have confidence that they are going to provide you the cutting performance you need and expect from your rider and zero turn mower.