It is a 3-in-1 blade for mulch, bag and side discharge purposes. This part is designed to circulate the grass longer so it can be cut into smaller pieces. This makes your grass clippings better as mulch since the smaller clippings will decompose more quickly, releasing their nutrients into the soil.
Blade Size(L*W*T): 538*76*3.8MM
Center Hole: 6 Point Star
Blade Type: Mulching Blade
Similar to: MTD 2-Blade Mulching Set 21.23" 742-04126, 742-0616, 742-0616A, 942-04126, 942-0616A, 742-0499, 742-0499A, 942-0499A 42-Inch Cut
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