The Genuine Factory Parts 21 in. 3-in-1 Blade is designed to provide a great looking cut whether you are bagging, mulching or side discharging. Mowing on dull, worn blades can rip and tear the tips of the grass and leave your grass vulnerable to disease and browning. Genuine Factory Part blades are original equipment blades for dewalt, 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 walk behind mower.. Replaces 490-100-C142, CMXGZAM100142, 490-100-Y142 and DXGX100142. Original Equipment part number 742-05643, 742P05643. Blade has an S-Shaped Center Hole Pattern, One Blade Set. Features: No Additional Features. Fits Brands: Craftsman,Cub Cadet,DeWalt,Troy-Bilt. Fits Deck Size (in.): 21 inches. Fits Models: 21 in. Decks with S-Shaped Center Hole. Used with Equipment Type: Push Mower,Walk Behind Mower. Blade Length (in.): 21 in. Cutting Width (in.): 21 inches. Product Depth (in.): 21 in. Product Height (in.): 1 in. Product Width (in.): 2.25 in